NPR News: This week in science: Pompeiian frescoes, dark energy and the largest marine reptile

This week in science: Pompeiian frescoes, dark energy and the largest marine reptile
NPR's Mary Louise Kelly talks with Emily Kwong and Rachel Carlson of Short Wave about newly unearthed Pompeiian frescoes, how dark energy may be changing, and the largest known marine reptile.

Read more on NPR