Presented by Franklin Fuller. Over billions of years, plants and cyanobacteria changed the Earth’s atmosphere by inhaling carbon dioxide, storing the carbon in solid biomass and exhaling oxygen.

Presented by Justin Myles. As the universe expanded from the Big Bang, regions where the density of matter was higher than average grew into galaxies and clusters of galaxies.

Presented by Aaron Lindenberg. As we reach the limits of high-speed computation based on silicon, ideas for the next generation of computers have focused on electrically switchable nanoscale devices that operate in ways similar to the neurons and synapses of...