Scientific Inquiry Leads to Using Fluoride for Healthy Teeth
Posted on April 18, 2015 Comments (0)
This webcast, from the wonderful SciShow, explores how we discovered fluoride helps prevent tooth decay and how we then used that knowledge and finally discovered why it worked.
I love stories of how we learn for observing what is happening. We don’t always need to innovate by thinking up creative new ideas. If we are observant we can pick up anomalies and then examine the situation to find possible explanations and then experiment to see if those explanations prove true.
When working this way we often are seeing correlation and then trying to figure out which part of the correlation is an actual cause. So in this dental example, a dentist noticed his patients had bad brown stains on their teeth than others populations did.
After investigation the natural fluoridation of the water in Colorado Springs, Colorado, USA seemed like it might be an explanation (though they didn’t understand the chemistry that would cause that result). They also explored the sense that the discolored teeth were resistant to decay.
Even without knowing why it is possible to test if the conditions are the cause. Scientists discovered by reducing the level of fluoridation in the water the ugly brown stains could be eliminated (these stains took a long time to develop and didn’t develop in adults). Eventually scientists ran an experiment in Grand Rapids, Michigan and found fluoridation of the water achieved amazing results for dental health. The practice of fluoridation was then adopted widely and resulted in greatly improved dental health.
In 1901, Frederick McKay, a recent dental school graduate, opened a dental practice in Colorado Springs, Colorado. He was interested in what he saw and sought out other dentists to explore the situation with him but had little success. In 1909, he found some success when renowned dental researcher Dr. G.V. Black collaborate with him.
Dr. H. Trendley Dean, head of the Dental Hygiene Unit at the National Institute of Health built on their work when he began investigating the epidemiology of fluorosis in 1931. It wasn’t until 1945 that the Grand Rapids test started. Science can take a long time to move forward.
Only later did scientists unravel why this worked. The fluoride reacts to create a stronger enamel than if the fluoride is not present. Which results in the enamal being less easily dissolved by bacteria.
Health tip: use a dental stimudent (dental picks) or floss your teeth to maintain healthy gums and prevent tooth decay. It makes a big difference.
Related: Why does orange juice taste so bad after brushing your teeth? – Microbiologist Develops Mouthwash That Targets Only Harmful Cavity Causing Bacteria – Using Nanocomposites to Improve Dental Filling Performance – Finding a Dentist in Chiang Mai, Thailand – False Teeth For Cats – Why Does Hair Turn Grey as We Age?
MudWatt: Make Power From Mud!
Posted on April 11, 2015 Comments (0)
Keegan Cooke and Kevin Rand created MudWatt kits as a way to engage kids/students with science. From the website:
Unfortunately, our experience in school wasn’t unique. In 2011, less than one-third of 8th graders in the U.S. were deemed proficient in science. Today, 70% of the fastest growing careers are in STEM fields. The supply of STEM education is not meeting the demand.
Most of the world’s mud contain microbes that produce electricity when they eat. That is the engine driving the MudWatt. Colonies of special bacteria (called shewanella and geobacter) generate the electricity in a MudWatt.
The electricity output is proportional to the health and activity of that bacterial colony. By maintaining these colonies in different ways, you can use MudWatt to run all kinds of great experiments. Thus the MudWatt allows kids to engage with science, using their natural curiosity to experiment and learn. Engaging this too-often-neglected human potential will bring joy to those kids (as kids and as grown-ups) and benefit our society.
With standard topsoils, typical power levels are around 100 microWatts, which is enough to power the LED, buzzer, clock, etc..
We Have Thousands of Viruses In Us All the Time
Posted on April 4, 2015 Comments (0)
Biology and the amazing interactions within a human body are amazing. Our bodies are teeming with other life (and almost life – viruses). All these microbes have a drastic impact on our health and those impacts are not always bad.
But every once in a while, one of these viral inhabitants might help us out.
Young people infected with a type of herpes virus have a better immune response to the flu vaccine than those not infected, scientists at Stanford University report Wednesday. In mice, the virus directly stops influenza itself.
We’re talking about a ubiquitous critter, called cytomegalovirus. About half of all Americans carry it. And so do nearly 100 percent of people in developing countries.
In younger people, CMV had the opposite effect that Davis had predicted: “The virus ramped up the immune system to give better protection from pathogens,” Mark Davis says. “We tested only for the flu, but I speculate it protects against everything.”
So should we all go out and get infected with CMV? No way! Davis exclaims.
You see, CMV has a dark side. It can become dangerous if the immune system is suppressed, which happens after an organ transplant or during treatments for autoimmune disorders. CMV is also a concern for pregnant woman. It’s the top viral cause of birth defects worldwide.
The human microbiome is incredible and teams with thousands of species (bacteria, viruses, members of domain Archaea, yeasts, single-celled eukaryotes, helminth parasites and bacteriophages). The complexity of interactions between all the elements of what is in our bodies and cells is one of the things that makes health care so challenging. It is also fascinating how these interactions provide benefits and costs as they work within our bodies.
The fact that we have evolved in concert with all these interactions is one of the big problems with anti-biotics. Antibiotics are miraculous when they work, but they can also decimate our natural micro-biomes which does create risks.
I would have thought Stanford wasn’t still supporting closed science Sadly this research is not published in an open science manner.
Related: Foreign Cells Outnumber Human Cells in Our Bodies – Microbes Flourish In Healthy People – Tracking the Ecosystem Within Us – People Have More Bacterial Cells than Human Cells – Cats Control Rats With Parasites – Skin Bacteria
Camera Trap Images of Very Rare Wild Cats
Posted on March 28, 2015 Comments (2)
This video show some wonderful images from remote cameras equipped to film when an animal is spotted. These camera have aided scientists in understanding wildlife in their natural environment and also by providing us cool images.
Yacouba Sawadogo – The Man Who Stopped the Desert
Posted on March 8, 2015 Comments (1)
Quote from the video
Dr. Chris Reij, Vrije University of Amsterdam.
As is normally the case making improvements in the real world is challenging and visionaries often face setbacks. Even when they have success that success is threatened by those that want to take the rewards but ignore the lessons. The clip above is a excerpt from the documentary film on his efforts.
Over-farming, over-grazing and over population have, over the years, resulted in heavy soil erosion and drying in this landlocked West African nation.
Zai is a very simple and low-cost farming technique. Using a shovel or an axe, small holes are dug into the hard ground and filled with compost. Seeds of trees, millet or sorghum are planted in the compost. The holes catch water during the rainy season, so they are able to retain moisture and nutrients during the dry season.
According to the rules of Zai, Yacouba would prepare the lands in the dry season – exactly the opposite of the local practice. Other farmers and land chiefs laughed at him, but soon realized that he is a genius. In just 20 years, he converted a completely barren area into a thriving 30-acre forest with over 60 species of trees.
Yacouba has chosen not to keep his secrets to himself. Instead, he hosts a workshop at his farm, teaching visitors and bringing people together in a spirit of friendship. “I want the training program to be the starting point for many fruitful exchanges across the region
2014 Ranking of the World’s Best Research Universities
Posted on February 28, 2015 Comments (0)
Shanghai’s Jiao Tong University produces an annual ranking of research universities. The methodology values publications and faculty awards (Nobel and Fields) which belies the focus on ranking research not for example the quality of education provided.
You could argue one measure does partially address teaching as the Nobel and Fields prizes to alumni are created to the institution (that is separate from a measure of faculty that receive those honors). I would agree it partially measure the education though it also measures the ability of that school to attract the absolute best candidates (whether they would have been just as successful going elsewhere is a fair question).
Results from the 2014 rankings of top 500 universities with the number of schools by country:
|location||Top 100||% of World
|% of World GDP||% of top 500|
The top countries for top 100 and top 500 schools are listed above, but I skip over many after the top 7 or 8 to include a few countries I like to watch, see the ranking site for the full list. Country population and GDP data were taken from the World Development Indicators 2013, by the World Bank.
There is little change in top 100 since 2008, which I think is a good sign, it wouldn’t make much sense to have radical shifts quickly in this type of ranking. The USA lost 2 schools in the top 100, UK lost 3, Germany lost 2, Switzerland gained 2, Netherlands gain 2…
There is more change in the top 500 where changes are more sensible (there is probably not much separating schools ranked in the 300’s from those in the 500’s so variation and strong pushes (from countries like China) can have an impact. China gained 14 more schools in the top 500. China’s GDP also increased from 6.6% of global GDP to 11.7%.
3D Printing at Home: Today, Challenges and Opportunities
Posted on February 21, 2015 Comments (8)
Guest post by Noah Hornberger
The State of 3D Printing at Home
Rapid prototyping is very rewarding. Moving from an idea that you had during breakfast to an object you can hold in your hands by lunchtime feels like magic or science fiction.
Modeling tools are getting easier to use, making the actual process of designing 3D objects fairly intuitive and dare I say . . . easy. I suspect home 3D printing is empowering a silent revolution that will be more and more apparent in the coming years.
Even so, there is a lot of quirkiness to the 3D print technology that an average consumer is probably not ready to deal with. In this post I want to give inside information I have learned by running my own home-based 3D print business. I have been there in the trenches, with a queue of orders, a few 3D printers and the drive to make it happen. And let me tell you that without the drive to push past the obstacles, it really would not be possible to run a 3D print-on-demand business this way.
3D printers have enabled me to pull off an impossible task of distributing my own artistic products to an international market. I have shipped to USA, Spain, Australia, Norway, Canada, and the UK. And this May of 2015 marks my first year of owning a 3D printer.
So there is some magic I would say in being able to move through iterations of your ideas so fast. And magic in being able to post photos of your products that people can understand to be real and tangible things.
I have had ideas for products for many years and even tried to launch them (unsuccessfully). But now things are different. I do not have to convince people that an idea is good, I can show them a real example of finished art they can own.
I would argue that 3D modeling is the easiest part of the process. Getting a spectacular print can take some work and patience, because it can involve re-starting the printer with small changes in settings each time. As an American trained artist, I have a tendency to want things to be fast and easy. I want to press a button and it just works. 3D printers can kind of promise this ability, but most often, I am stepping in to keep the machines on track.
Biomass Fueled Power Generator from All Power Labs
Posted on February 14, 2015 Comments (0)
All Power Labs produces biomass fueled power generators. They have grown from a open science and engineering foundation to their current position. I really like how they are focused on promoting understanding and encouraging collaboration.
They reject the copyright cartel closed science mindset; which is something I like. Their product takes waste biomass; for example walnut shells, coconut shells, hardwood chips (Oak, Beech), softwood chips (Douglas Fir, Pine). It also takes corn cobs, palm kernel shells and others but there are additional challenges to operation.
Their products use gasification which is most simply thought of as choked combustion or incomplete combustion. It is burning solid fuels like wood or coal without enough air to complete combustion, so the output gas still has combustion potential. The unburned gas is then piped away to burn elsewhere as needed.
The Power Pallet is a complete biomass power generation solution that converts woody biomass into electricity. It costs $29,995 which translates to a cost of $1-$2/watt which is more cost effective that alternatives. They have significant sales in developing markets where power is often problematic. It is specifically not suited to some fuel – wastepaper (could maybe work in pelletized form), municipal waste, coconut husk…
This webcast is the start of a presentation on the history and current state of their efforts (continue to view other clips for the whole presentation):
Related: Ethanol: Science Based Solution or Special Interest Welfare – Do It Yourself Solar Furnace for Home Heating – Kudzu Biofuel Potential Chart of Wind Power Generation Capacity Globally from 2005 to 2012 – Turning Trash into Electricity (2006)
Using The Building of Robots to Engage Students in Learning
Posted on February 7, 2015 Comments (0)
Fundi bots has a mission to use robotics training in African schools to create and inspire a new generation of problem solvers, innovators and change-makers. I believe strongly in this type of effort. We waste so much human potential by killing students design to learn. Instead we need to create systems that not only don’t kill that desire but allow it to flourish.
Fundi Bots focuses on the technological process of building robots as a way for students to look at the world around them from a practical, solution oriented perspective. By guiding students through problem identification, brainstorming, collaboration, construction, programming, final deployment and system feedback, we show them how the problems around them can be solved through a technological approach and persistent reductive analysis.
Fundi Made is an effort to create professional grade electronics right in our Fundi Spaces, and deploy the products in five core market segments; home-automation, agriculture, energy, security and health.
Related: Promoting Innovation in Sierra Leone – Letting Children Learn using Hole in the Wall Computers – Given Tablets but No Teachers, Kids Teach Themselves (Having Never Seen Advanced Technology Before) – Teaching Through Tinkering – Encouraging Curiosity in Kids – 20th Annual US First Robotics Competition (2012)
Teixobactin – New Antibiotic Attacks Ability of Bacteria to Build Cell Walls
Posted on January 31, 2015 Comments (0)
It could become a powerful weapon in the battle against antimicrobial resistance, because it kills microbes by blocking their capacity to build their cell walls, making it extremely difficult for bacteria to evolve resistance.
It would be great if the exciting results carried through to real world results similar to the hope. Medical research is full of promising initial results that fail to deliver, however. We are at great risk if some new miracle anti-biotic isn’t found. Many people are investigating potential solutions.
Lewis’s group found a way around the problem by developing a device called an iChip that cultures bacteria in their natural habitat. The device sandwiches the bugs between two permeable sheets. It is then pushed back into the ground where the microbes grow into colonies.
Working with a Massachusetts-based company, NovoBiotic, and researchers at the University of Bonn, [Kim] Lewis’s group screened 10,000 soil bacteria for antibiotics and discovered 25 new compounds. Of these, teixobactin was the most promising.
Though promising, Lewis said that years more work lie ahead before the drug could be available. Human clinical trials could begin within two years to check its safety and efficacy, but more development would follow that.
It is wonderful to read about the great work so many scientists are making in researching potential life saving drugs. Hopefully this antibiotic will save us from what will be catastrophic harm if some new antibiotic is not available soon.
Related: Search for Antibiotic Solutions Continues: Killing Sleeper Bacteria Cells (2013) – New Family of Antibacterial Agents Discovered (2009) – Potential Antibiotic Alternative to Treat Infection Without Resistance (2012)
Ranking Countries by Scientific Publication Citations: USA, UK, Germany…
Posted on January 24, 2015 Comments (1)
The SCImago Journal and Country Rank provides journal and country scientific indicators developed from the information contained in the Scopus database. I posted about this previously (in 2014, 2011 and 2008).
The data in the post is based on their data from 1996 through 2013. The web site also lets you look at these ranking by very specific categories. For example biotechnology #1 USA, #2 Germany, #3 UK, #4 Japan, #12 China or human computer interaction #1 USA, #2 Germany, #3 UK #4 Japan, #13 China).
I like looking at data and country comparisons but in doing so it is wise to remember this is the results of a calculation that is interesting but hardly definative. We don’t have the ability to measure the true scientific research output by country.
The table shows the top 6 countries by h-index and then some others I chose to list.
|% of World
|% of World GDP||total cites|
|Additional countries of interest (with 2013 country rank)|
|19) South Korea||375||258||161||.7||1.7||5,770,844|