The annual event challenges graduate students to present their research in three minutes using only one slide.

When Ella al-Shamahi went to college, she thought she'd be able to prove Darwin's theory of evolution was wrong. Instead, she was convinced the science was right.

Okay: Lyft CEO David Risher. Here we go. This interview has been lightly edited for length and clarity. David Risher, you’re the CEO of Lyft. Welcome to Decoder.