A huge study suggests ageing scientists are part of the problem
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A handpicked article read aloud from the latest issue of The Economist
The Trump administration seems to want less clean energy and more preventable diseases
A subset of journal editors may be partly responsible
On screen and in real life, they are getting smaller anyway
It could also be useful in finding life on other planets
That undermines the case for blanket bans or time limits, writes Sema Sgaier
