Many jellyfish are transparent, and they have seemingly simple movements and few visible interacting parts. They should, therefore, be easy to synthesize with man-made parts, but that's not what bioengineers discovered when they recently built a jellyfish mimic from rat heart cells attached to a silicone frame.

Evolutionary scientists do not know how the human brain's ability to process language supposedly evolved from a non-speaking ancestor. Recent technological advances have enabled scientists to explore this subject in new ways, and one researcher's review reveals two flaws that underpin the whole research effort.