As a secondary school educator, I often see students sharing their drinks with one another. This bugs me more than anything because it causes germs to be easily spread from one person to another. The problem is, students have this misconception that if they are not sick, then the person they are sharing their drink with won't get sick either. Sounds rational, but is it true? Definitely not. Each person's immune system is unique, and so is our microbiome (as described in the video below). What may be harmless to one person may not be so much to another. I believe this video does an excellent job demonstrating that not only are humans unique in a sense that we each have our own personalities, have different occupations, and come from differe ...

See what happens when scientists drop a bowling ball and a feather in the world's largest vacuum; for the science-illiterate viewers out there (sorry ), a vacuum is a space entirely devoid of matter (also known as an absolute vacuum). A lot of you probably already know how this one ends, but that doesn't make watching it play out any less spectacular.



...

This video explains it quite well. The key hormone in question is serotonin. Serotonin is known to play a role in depression. Low serotonin levels are believed to be the reason for depression and associated symptoms of anxiety, apathy, fear, feelings of worthlessness, insomnia and fatigue. The opposite is true when a high-level of serotonin is present, you feel jovial and enthusiastic. MDMA promotes the formation of this hormone.

...

Are frozen goods really that bad for our health?

Watch the fastest animal in the world - a peregrine falcon - effortlessly accelerate to speeds of more than 290 km/h to chase a plummeting skydiver.

Peter Diamandis makes a case for optimism -- that we'll invent, innovate and create ways to solve the challenges that loom over us. "I'm not saying we don't have our set of problems; we surely do. But ultimately, we knock them down."

The Chernobyl disaster of 1986 was one of the worst man-made disasters of the 20th century. An explosion and fire released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe. During the accident itself, 31 people died, and long-term effects such as cancers and deformities are still being accounted for.

An abandoned ferris wheel and buildings reclaimed by nature - the remains of the 1986 Chernobyl disaster show what a city looks like when everyone disappears.