Cell migration is fundamental to many processes such as embryonic development and wound healing, and cancer metastasis. Understanding the mechanisms behind how cells move represents an important piece to the puzzle of regenerative medicine and many therapeutic strategies, as discussed further here.
Aerogels are the world's lightest (least dense) solids. They are also excellent thermal insulators and have been used in numerous Mars missions and the Stardust comet particle-return mission. The focus of this video is silica aerogels, though graphene aerogels are now technically the lightest.