The knee is the biggest joint in our body. Without our knees, we couldn't walk or sit down - not to mention jump. They withstand enormous strain every day. For brief moments, they can carry up to one and a half metric tons.
Prime Minister Malcolm Turnbull has called a North Korean letter to parliament "basically a rant" against Donald Trump. Turnbull praised China, saying the letter showed that fresh sanctions were hitting Pyongyang hard.
Even after multiple rounds of sanctions, Pyongyang is continuing to provoke the international community with weapons testing. China and the US face bad options, and each other, in creating a united front.
Climb the stairs with a spring in your step - literally! Scientists have created suspension steps that absorb users' energy during descent, to give it back later. They're supposed to make life easier for the elderly.
North Korea's rapid advancement in mastering missile technologies has heightened the risk of a vicious conflagration on the Korean Peninsula. A moratorium on new tests could help to diminish that risk, says Martin Fritz.
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