SPECIAL MENTION: In a hospital, cleaning up thoroughly can be lifesaving. Kinnos Highlight, developed during the Ebola outbreak in west Africa, is designed to make the process more effective. Attached to a container of disinfecting wipes, the system splashes each wipe with a dye as it’s dispensed; the color fades as the surface is fully disinfected.

More Must-Reads From TIME

Contact us at letters@time.com.

Hydration Made Fun
A Modern Flip Phone
A Saliva Pregnancy Test
More Than a Fast Car
A Breakthrough Bassinet