Physicists have found evidence of a particle made entirely of force-carrying gluons. Plus, what changes to US vaccine recommendations mean for children and the ways food scientists are improving chocolate.

Scientists have predicted the existence of a particle made of gluons for a long time, but detecting it has taken decades.

Physicists have found evidence of a particle made entirely of force-carrying gluons. Plus, what changes to US vaccine recommendations mean for children and the ways food…