Physicists use the Navier-Stokes equations to describe fluid flows, taking into account viscosity, velocity, pressure and density. But because of turbulence in fluids, proving that the equations always make sense is one of the hardest problems in physics and mathematics.
Evidence from the oceans decisively shows that an asteroid strike caused the last mass extinction, argues Pincelli Hull. The cataclysm continues to hold lessons for today.
Omololu Akin-Ojo of the East African Institute for Fundamental Research discusses his plans to invigorate theoretical physics in Africa, including by focusing on problems related to energy and water that will especially impact the continent.
James P. Allison of the University of Texas MD Anderson Cancer Center discusses what initially drew him to immunology as a field and why many scientists used to be skeptical that an immunological strategy for killing cancers would work.
Scarlett Howard describes how and why she taught honeybees math.