Posts about science webcasts

Exercise Is Really Really Good for You

Nice webcast that reviews the benefits of exercise that are confirmed by medical studies.

Other than [not] smoking there are few modifiable risk factors that seem to have the huge impact on heath activity does…

150 minutes a week of moderate (walking briskly, biking, even mowing the lawn maybe) activity (30 minutes a day 5 days a week) is a decent target for a minimum amount of activity for most people. I have not bought a car since my move (2 months ago) and walk to the grocery store, library, bank, subway, restaurants which is easily 30 minutes and usually more each trip. And for further away places I am biking.

Another option is 25 minutes of vigorous activity 3 times a week and 2 days a week of weight training. Basketball is my favorite form of vigorous activity and sometimes my biking and yard work reach that mark. I like swimming (and I did swim a fair amount when I had a pool at my condo but I don’t swim now as it isn’t right downstairs from my bedroom). I like vigorous activity as I end up feeling refreshed and it serves as a noticeable form of stress release for me.

Related: Better Health Through Exercise, Not Smoking, Low Weight, Healthy Diet and Low Alcohol IntakeExamining the Scientific Basis Around Exercise and Diet ClaimsInactivity Leads to 5.3 Million Early Deaths a Year

Camera Trap Images of Very Rare Wild Cats

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.

Related: Rare Chinese Mountain CatBornean Clouded LeopardPhotos of Rare Saharan Cheetah and Other WildlifeScottish Highland Wildcats

Biology: How Wounds to Our Skin Heal

This is an interesting webcast looking at how our bodies heal wounds to our skin.

Related: Science Explained: How Cells React to Invading VirusesTissue Regeneration in AnimalsScience Explained: Cool Video of ATP Synthase, Which Provides Usable Energy to UsLooking Inside Living CellsA Healthy Lifestyle is More About Health Care than the Sickness Management That We Call Health Care Is

Ocean Exploration – Live Feed and Highlights

Nautilus Live provides a live view of the E/V Nautilus as it explores the ocean studying biology, geology, archeology, and more. The site also includes highlights such as this video of a siphonophore.

Siphonophores are actually made up of numerous animals even though they look like one animal. These amazing colonial organisms are made up up many smaller animals called zooids, and can be found floating around the pelagic zone in ocean basins. The Portugese Man O’ War is a famous siphonophore.

Each zooid is an individual, but their integration with each other is so strong, the colony attains the character of one large organism. Indeed, most of the zooids are so specialized, they lack the ability to survive on their own.

Related: Giant Star Fish and More in AntarcticaHydromedusae, Siphonophora, Cnidarians, Ctenophores (what are jellyfish?)Macropinna Microstoma: Fish with a Transparent HeadLarge Crabs Invading Antarctic as Waters Warm

Here is another video from Nautilus, showing a large dumbo octopus:

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Why do Bats Transmit so Many Diseases like Ebola?

Bats are generally wonderful creatures and helpful to us. For example, they eat lots of insects that are annoying (like mosquitoes) and pollinate lots of plants. Of course, they also eat lots of good (for us humans) insects but the insects still seem to be able to fulfill their environmental niches so all is good.

And they are flying mammals which is, of course, cool.

But bats also transmit virus to us, which do us lots of damage. As the video explains as we have intruded into bat territory and chopped down their natural feeding spots we have come into contact with them more. And because bats evolved to be very resilient to virus and they live in large colonies (for easy transmission of the viruses to lots of bats) they can host viruses and survive long enough to infect lots of other bats, and to infect us if we meet them.

I actually didn’t know this (mentioned in the video): most viruses have a very difficult time surviving even with temperatures a bit above the normal human temperature (98 degrees Fahrenheit). Bats, while they fly, have internal temperatures that soar to 104 degrees (40 degrees centigrade) which kills off most viruses, but certain hardy viruses survive. This also explains why we run fevers when we are sick (which then can kill off viruses) – which I am sure I learned at some point but I forgot. But for the bat viruses that strategy doesn’t work.

Bats, of course, are not impervious to disease. In the USA a disease has killed more than 90 percent of the cave bats in Eastern states.

One of the causes of the current ebola outbreak is believed to be people eating bats in West Africa.

Related: Ebola Outbreak in Uganda (2007)A Breakthrough Cure for Ebola (2010)Swine Flu: a Quick Overview (2009)

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Looking Inside Living Cells

Johns Hopkins’ molecular biologist Jin Zhang explains how she uses light to see where and when within cells specific molecular processes occur and what happens when they go wrong.

Related: How Lysozyme Protein in Our Tear-Drops Kill BacteriaScience Explained: How Cells React to Invading VirusesNobel Prize in Physiology or Medicine 2012 for Reprogramming Cells to be PluripotentWebcast Exploring Eukaryotic Cells

Science Explained: How Cells React to Invading Viruses

This illustrated webcast introduces the microscopic arsenal of weapons and warriors that play a role in the battle for your health.

TED education has been putting out some good videos which is a wonderful thing to see. It is wonderful to let people everywhere (kids and adults) that are interested in learning (and that have internet access) can learn about the world around us. Traditional educational institutions have not done much with this opportunity to broaden their impact.

The video looks at the cells reaction to a virus infiltrating the cell.

Related: Cells AliveScience Explained: Cool Video of ATP Synthase, Which Provides Usable Energy to UsThis webcast is packed with information on the makeup and function of eukaryotic (animal) cellsCool Animation of a Virus Invading a Person’s BodyCell Aging and Limits Due to TelomeresWebcast of a T-cell Killing a Cancerous Cell

How Wolves Changed the Yellowstone Ecosystem

A great short video explaining the dramatic changes to the Yellowstone ecosystem with the re-introduction of wolves. Even the rivers changed.

Related: Light-harvesting Bacterium Discovered in YellowstoneFishless FutureThe Sea Otter storyYellowstone Youth Conservation Corps Polar Bears Playing with HuskiesCurious Cat travel photos of Yellowstone National Park

How Our Brains React to Sugar

The dopamine reaction to sugar leads us to seek out that good feeling. Sugars can lead us astray by encouraging us to seek more than is good for us.

A sensible explanation is that sugars provide high calories and were rare and so the more we could find the better. Evolution takes a long time to adjust though (and of course misses things that don’t affect passing on successful genes) so long (in our human timeframe, short in evolutionary timeframe) after we have far too much sugar available our brains our encouraging us to eat all we can find. This of course, at best, is a very oversimplified view.

Related: Can Just A Few Minute of Exercise a Day Prevent Diabetes?Does Diet Soda Result in Weight Gain?How Caffeine Affects Your Body

Learn About Biology Online

Very cool site for learning about biology. I have tried the courses offered by Coursera but they are too structured for my taste. I want to be able to learn at my pace and dip into the areas I find interesting. Coursera is more like a real course, that has weekly assignments and the like.

Survivebio is a resources that matches my desires exactly. You can go and learn about whatever topics you desire, when you desire. The site offers webcasts, games, flashcards, chapter outlines, practice tests and a forum to discuss the ideas.

In this webcast, Paul Andersen discusses the specifics of phylogenetics. The evolutionary relationships of organisms are discovered through both morphological and molecular data.

The aim of the SurviveBio web site is to aid AP (and college) biology students. But it is also a great resource to learn about biology if you are interested in that topic. Hopefully they will add more webcasts. The site uses webcasts from Bozeman Science which has a huge number of very good videos on biology and also, chemistry, physics, earth science, statistics, anatomy and physiology.

Related: Great Webcast Explaining the Digestive SystemsCell Aging and Limits Due to TelomeresHuman Gene Origins: 37% Bacterial, 35% Animal, 28% Eukaryotic

Mabel Mercer sings Experiment by Cole Porter

Mabel Mercer sings Experiment by Cole Porter:

Lyrics for Experiment:

Before you leave these portals to meet less fortunate mortals,
There’s just one final message I would give to you.
You all have learned reliance on the sacred teachings of science
So I hope through life you never will decline in spite of philistine defiance
To do what all good scientists do.
Make it your motto day and night.
Experiment and it will lead you to the light.
The apple on the top of the tree is never too high to achieve,
So take an example from Eve, experiment.
Be curious, though interfering friends may frown,
Get furious at each attempt to hold you down.
If this advice you only employ, the future can offer you infinite joy
And merriment.
Experiment and you’ll see.

The lyrics were included in the book by George Box, my father and Stu Hunter: Statistics for Experimenters.

Related: Scientists Singing About ScienceHere Comes Science by They Might Be GiantsThey Will Know We are Christians By Our LoveCambrian Explosion Song

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