WATCH: Half a million people to storm Area 51

Now Playing: It’s Morning, America: Tuesday, July 16, 2019

Now Playing: How to design a safe home for people with age-related macular degeneration

Now Playing: How a company went from making bras and girdles to a spacesuit fit for the moon

Now Playing: John F. Kennedy Jr.’s chief of staff reflects on his death 20 years later

Now Playing: CEO of Juul apologizes to parents for teen vaping epidemic

Now Playing: Florida expert brought in to capture gator in Chicago

Now Playing: Mom describes how she survived 4 days lost in mountains

Now Playing: Alleged victims confront Jeffrey Epstein in court

Now Playing: White Supremacist groups praise Trump’s attack

Now Playing: Barry remnants dump more rain, heatwave forms

Now Playing: Half a million people to storm Area 51

Now Playing: House explosion leaves 1 dead, 15 injured

Now Playing: Rescued hiker fled knife-wielding man, ate cactus

Now Playing: Amazon Prime Day tips

Now Playing: Charlottesville car rammer sentenced

Now Playing: Missing hiker found alive

Now Playing: Huge pod of dolphins spotted off California coast

Now Playing: Extraordinary look back as 50th anniversary of the US moon landing approaches

Now Playing: Jeffrey Epstein is ‘a scary person to have walking the streets’: Accuser

Now Playing: Woman who disappeared with dog while camping found alive