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.
Norway's domination at the Pyeongchang Games has continued, with more medals on Day 12. The Germans, meanwhile, upset world champions Sweden to advance to the semifinals of the men's ice hockey tournament.
Choga Lal Saini left his office job to grow fruit in the desert. Sixteen years later, he has created an oasis and become a source of farming knowledge for others near and far.
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.
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.
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