Can you answer this riddle?

你能猜出这个谜语吗？

《新英汉大辞典》

The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.

这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。

youdao

This riddle about the inversion of the universe.

这一宇宙万物颠倒之谜。

youdao

What's driven mathematicians crazy for three centuries is the simple desire to solve this riddle.

FORBES: Simon Singh says

Not enough of the physical structures of the theatres remain to solve this riddle, and the archaeological record is thin.

ECONOMIST: SHAKESPEARE��S PLAYHOUSE

Now, you can be the first to solve this riddle since the owner has put it up for sale on eBay.

ENGADGET: Alleged HP TouchPad running Android appears, can be yours on eBay (update: and another one!)