Are humans really at the top? Yes. We are the top of the food chain (unless we are eaten by a shark!), but is it always beneficial to be at the top of the food chain?

Usually food chemicals that we eat are used by our bodies and any waste is exhaled, defecated and urinated out of us. However, some chemicals such as heavy metals like lead and mercury can't be expelled from plants and animals so they build up in the plant and animal bodies. This is called biomagnification (biological magnification) because the amounts can accumulate more and more in animals further along the food chain till they reach a toxic level.


In human-made environments, radio-active chemicals such as uranium are a problem because the time they take to break down (half-l ...

Sadly, the remaining rhinos in Mozambique are reported to have been wiped out due to poaching. The animals had been under protection on a preserve, but 30 of the 100 rangers who were supposed to be caring for the animals are believed to have been aiding poachers, and are currently awaiting trial. Even if found guilty, it will only be a misdemeanor.

Rhino horns are a big market in certain Asian countries, primarily China and Vietnam, and are used in folk remedies or for ornamental purposes. If poaching continues, experts warn that elephants will suffer the same fate. ...

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.