Roofr

is a Roofing Marketplace with Instant Satellite Roofing Estimates (YC S17)

Roofr uses satellite imagery to give home owners free estimates for roof replacements. They let property owners accurately estimate the cost of their own roofs in seconds simply by entering the property address.

The Technical Challenges of Measuring Gravitational Waves

Rana Adhikari of LIGO

Rana Adhikari is a Professor of Physics at Caltech and a member of the LIGO team, who were the first to measure gravitational waves.

The Customization Curve

A few months ago, I was talking to a startup about how individual customers wanted them to do different things.

Elizabeth Iorns on Biotech Companies in YC

Elizabeth Iorns is cofounder and CEO of Science Exchange. She’s also an Expert here at YC. She came in to answer some of the most common questions we get from founders in biotech.