Bob Juncosa has a passion for old airplanes.
"This is one of the models that I made," Juncosa says. "This is a 1915 Sopwith Pup."
Juncosa points to a photo on his smartphone. It's an old biplane built to quarter scale. It has a wingspan of about eight feet.
Asked why he builds vintage airplanes, Juncosa says it's pretty much the same reason he runs a biotech company.
"It's the challenge of 'No one's done that, now let's see if we can go do that,' " Juncosa says. The tricky part with both a biplane and a company, he says, is to "get it off the ground and make it work."