First up: San Francisco 49ers linebacker Chris Borland surprised the sports world by announcing he’ll retire from professional football at age 24, due to the risks associated with concussions. We chat with Sports Business Journal’s Daniel Kaplan about Borland’s decision and what it means for the game. Then, it’s a short trip over to Oakland, where we talk to carpenter Greg Kloehn, who uses salvaged wood and junk to build tiny homes for people without them.