Ryan Serhant founded two apps that didn't take off but raised $45 million to help fund his third. Here's what he did differently.

Tech Insider : Business
Ryan Serhant
Ryan Serhant believes his new app will make day-to-day work easier for real estate agents.

Crystal Cox/Business Insider

I tried every Celsius energy-drink flavor I could find and ranked them from worst to best. One clearly blew the others away.

Tech Insider : Business
Seven cans of different flavors of Celsius lined up in a row.
I tried seven different flavors of Celsius energy drinks.

Beth Heyn

I worried about who would care for my child with significant medical needs. I gave her 3 siblings to help when I'm gone.

Tech Insider : Business, Travel
Four siblings posing for a photo
The author had three more kids after her first daughter was born with significant medical needs.

Courtesy of the author

I cruised almost the same itinerary with Royal Caribbean and Norwegian Cruise Line, and there was a clear winner

Tech Insider : Travel, Travel, Business
A woman and her husband dining on a cruise ship and smiling.
My husband and I have fallen in love with going on cruises.

Felicia Slattery

I was a teacher for 10 years. I was never really happy until I changed careers.

Tech Insider : Business, Technology
Rear view of multiracial students raising hands in classroom during lecture
The author (not pictured) decided to quit teaching and is now a freelance writer.

Maskot/Getty Images/Maskot

When my ex and I separated, I moved out of our family home. Having my own space made me a better mom.

Tech Insider : Business
Woman arranging things in her new apartment. She has blonde hair up in a bun and is wearing a yellow sweater.
The author (not pictured) moved into a new apartment when she and her ex separated.

Getty Images

I live on an island in Maine where kids still get to be kids. They play unsupervised, and the community looks after them.

Tech Insider : Business
Rear view of two sibling boys running in forest together
The author, not pictured, is a teacher in North Haven, Maine.

Pekic/Getty Images

I get injectables and laser skin therapies outside the US. I've saved $3,955 already — and I get treatments during layovers.

Tech Insider : Travel, Travel, Business
Woman in heels wheeling suitcase and bag through airport
By getting treatments at local med spas during international layovers, I've optimized my time and saved money.

miodrag ignjatovic/Getty Images

I was having a hard time getting my teens to talk about their day. These 3 questions changed everything.

Tech Insider : Business
Mom and kids at a game
The author found that her teens wouldn't talk to her about their days until she started asking the same things.

Courtesy of the author

25 things you won't believe are turning 25 in 2025

Tech Insider : Sports, Business
international space station 2000
The International Space Station's first live-in crew arrived in 2000.

NASA/Getty Images

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