cold calls and emails have become an increasingly popular way to connect with even high-level executives. Billionaire investor Mark Cubanrecently invested in two different start-ups run by 20-somethings who sent him cold emails.

You could say Apple co-founder Steve Jobs and Tesla CEO Elon Muskwere early adopters: They used cold calls to land their very first internships.

"I've never found anybody that didn't want to help me if I asked them for help," Jobs said, referring to the cold call in a 1994 interviewarchived by the Silicon Valley Historical Association.

Here's how Jobs and Musk both used cold-calling to get a start on their professional careers.

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