Science

As case counts surge in China, rumors circulate about the effectiveness and safety of the made-in-China vaccines in use there. Here's what we know about CoronaVac and Sinopharm.

Afrigen is the linchpin of global project to use mRNA technology to empower low-resource countries to make their own vaccines against killer diseases from TB to HIV. What will it take to succeed?

Geologists rely on tiny crystals of the mineral zircon to understand the timing of key events in Earth's early days, like the rising of continents and the emergence of oceans.

Zircon is the "time-lords" of the earth. They are indestructible and take up radioactive materials, so they're used to track events in deep time that would otherwise be lost to us.