Honeybees in the United States can now be inoculated against a highly contagious bacterial disease. Plus, a successful geoengineering trial to counter ocean acidification and the five best science books this week.

• The world’s first honeybee vaccine has been approved in the United States. It prevents American foulbrood, a highly contagious bacterial disease that reduces larvae to brown goo.
• The vaccine contains a dead version of the bacteria, and is incorporated into the royal jelly that worker bees feed to the queen. The queen deposits the vaccine in her ovaries, which gives the developing larvae immunity.