We know a lot. But we don't know everything. In fact, science still has quite a few "big" questions left to answer. Physicist Marcelo Gleiser pokes at 10 of them, questions highlighted in a new book naming the most difficult scientific problems of ou...
Feel free to nap after reading this.
The visibility of distilled water is about 80 metres. Blue Lake, on New Zealand's South Island, clocks in at 76 metres. Here are the first-ever photos of this newly discovered natural wonder
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