Growing up sucks. Getting older is no fun. Having your body deteriorate to a shell of itself is embarrassing. But wrinkles and brittle bones are a fact of life. But why! PHD Comics and integrative Biologist Joao Pedro de Magalhaes explain in this nifty animated comic on what aging is and how we can use that understanding to extend our lifespan. My brain feels smarter, more wrinkled and I guess, older, just from watching it.
There's an iconic scientific image which depicts evolution, and it suggests that we went from monkey to man in six easy steps. The only problem is, that's kinda bull.
Think back to when you were a child visiting your grandparent's home. Do you recall a distinct scent when you walked through the door? Many people do and it turns out, it's not just in your head.
This might look like the result of some wild nuclear accident, but in fact this worm is perfectly healthy. It just happens to glow bright green when exposed to certain wavelengths of light.
Many animal species use tools, from insects, elephants and sea urchins to apes, badgers and octopuses, but there are only two animals who make hooks to catch food: humans and crows. Why we both do this is a mystery — and unraveling it could explain the reasons why tool use evolved in the first place.
The question of how long someone's heart would have to be stopped for before you can safely say that regardless of what you do, you're not going to be able to revive them is avery tricky question. It's not as simple as saying after 10 or even 20 minutes there's no hope. For instance, there are countless people who have been subject to hypothermia, have their heart stopped for over 45 minutes, and still have been successfully revived. So many, in fact, that the current guideline set by the American Heart Association (AHA) is that you continue trying to revive the person until their core body temperature is above 95 degrees Fahrenheit- 95 degrees, because below that is the technical definition of hypothermia. The mantra in that situation is, "They're not dead until they're warm and dead."