Now Playing: Tragedy in Alaska: Plane Crash Kills 5

Now Playing: Ted Stevens Dies at 86

Now Playing: Special education teacher helps student overcome disability

Now Playing: More than 40 injured in train crash near Philadelphia

Now Playing: New documentary explores Whitney Houston's sexuality, drug use

Now Playing: How to get your girls involved in coding

Now Playing: How to speak to your children about sexual assault on campus

Now Playing: DeMario Jackson speaks out about the 'Bachelor in Paradise' scandal

Now Playing: New study reveals a striking increase in serious allergy cases

Now Playing: Nikki Haley reacts to Charlottesville violence, Confederate monuments controversy

Now Playing: How adults make what's cool for children become uncool

Now Playing: Eclipse aftermath by the numbers

Now Playing: UN Ambassador Nikki Haley weighs in on US military strategy for Afghanistan

Now Playing: Last-minute suitcase solutions from Good Housekeeping

Now Playing: Phoenix mayor begs president not to visit amid protests

Now Playing: Heavy rains lead to water rescues in Kansas City area

Now Playing: Lawmakers to question key figure behind infamous Trump-Russia 'dossier'

Now Playing: Rescues underway as flash flooding hits the Kansas City metro area

Now Playing: Natalee Holloway's father speaks out as new leads surface 12 years later

Now Playing: Trump unveils his policy for US presence in Afghanistan