The main purpose of thought experiments, though, is to show that a problem is soluble in principle and so to encourage others to try to solve it in practice.

ECONOMIST: The universe, it appears, may not be alone

In the end, the main problem is not that designing good experiments is hard.

ECONOMIST: News from the lab

On the main table I noticed what looked like the ragtag remains of some Physics 101 lab experiments: rusted silver balls on different inclines, distressed balloons, a stained funnel, a markered flask, a calcium-speckled Bunsen burner, iron filings and sandpaper, large magnets, and batteries that could have been bought from a Chinese immigrant on the subway.

NEWYORKER: The Region of Unlikeness