Collison brothers lend backing to drone start-up Manna Aero

The billionaire siblings, who are behind the Stripe payments system, have invested in the start-up founded by Bobby Healy

The only thing better than an endorsement from a fellow founder is an endorsement from the biggest fellow founders on the planet right now: Thanks to John and Patrick Collison for your investment in @MannaAero – means a lot,” Healy tweeted