Hank, you adorable dork <3 :)
We made this animation for our December 2013 advent calendar - a journey through our chromosomes in 24 short films.
Watch the whole series here.
Inside the Operations and Checkout Building high bay at NASA’s Kennedy Space Center in Florida, technicians dressed in clean-room suits have installed a back shell tile panel onto the Orion crew module and are checking the fit next to the middle back shell tile panel. Preparations are underway for Exploration Flight Test-1, or EFT-1.
Orion is the exploration spacecraft designed to carry astronauts to destinations not yet explored by humans, including an asteroid and Mars. It will have emergency abort capability, sustain the crew during space travel and provide safe re-entry from deep space return velocities. The first unpiloted test flight of the Orion is scheduled to launch later this year atop a Delta IV rocket from Cape Canaveral Air Force Station in Florida to an altitude of 3,600 miles above the Earth’s surface. The two-orbit, four-hour flight test will help engineers evaluate the systems critical to crew safety including the heat shield, parachute system and launch abort system.
dubster said: Dear sci show why heavy metals (Led, Mercury) are harmful to humans while lighter ones like iron and magnesium are beneficial?
"Heavy metals" is more of a colloquial term than a scientific one. There are lots of very heavy metals that aren’t dangerous at all. We wear gold and silver and platinum in our jewelry. Bismuth is all up in your PeptoBismol and most of the lanthanides and actinides are safe. Also, lots of the lighter metals (particularly sodium and lithium) while being great in certain chemical forms, in their pure forms will kill you extremely quickly (and violently.)
What it comes down to is simply whether the metal interferes with the normal functioning of your body. And we’ve got complicated bodily chemistries so it turns out that there are around a dozen metals that you don’t want to get in your body. At the same time, some of them, like zinc, are helpful it certain chemical configurations. A great example of how it’s not about the metal so much as the chemistry of the body…copper is safe for humans, but is extremely toxic to fish.
dalekmcmuffin said: If two sets of identical twins have kids are their kids siblings?
Gentically, the would be indistinguishable from siblings…but they would still be geneological cousins.
EDIT - I should say “Largely indistinguishable.” A normal DNA test wouldn’t do it, but if you sequenced their whole genome, you would be able to tell which kid belonged to which couple because of random mutations. It would take a VERY BIG COMPUTER though.
mbcym said: Why do different instruments (or voices) in the same note still sound different (a violin and a piano sound differently even if they're playing the same note)?
This is extremely weird and difficult to explain…which is why we’re lucky to have Vi Hart: https://www.youtube.com/watch?v=i_0DXxNeaQ0
Baby Flamboyant Cuttlefish in egg case (on a sock?!) - Daniel Geary
Hey guys, my friend Dan is becoming a super talented underwater photographer. He refuses to get Tumblr, much to my dismay. Let’s try and convince him otherwise. Hands up if you’d like to see him post his stuff on Tumblr.