1. George Bush did the ALS ice bucket challenge after being nominated by “several Americans,” including his daughter, Jenna Bush Hager.
- Athletes probably won't break records at the Rio Olympics. In most events, top performers have already reached the limits of human biology, scientists say.
- Some Bernie-or-Busters protested Hillary Clinton's DNC speech, but a tightly organized plan — from chants to secret allies — kept heckling off TV.
- Sixteen people died after a hot air balloon caught fire and crashed in Texas Saturday.