New “organ-on-a-chip” technology offers alternative to animal studies.

With flimsy or no evidence that using unauthorized peptide drugs is effective in humans, buying the online and self-injecting is high-risk, uncontrolled human self-experimentation, writes Stuart Phillips.

Useful science and ambitious science are points along the same continuum, write Shay Freger and Matthew Leonardi: Today’s basic research becomes tomorrow’s applied science.