Warren Buffett isn't betting on bitcoin anytime soon. Over the weekend at the Berkshire Hathaway annual shareholders meeting, Buffett said the digital currency is "probably rat poison squared." Buffett has long been skeptical about cryptocurrencies. At the conference, Buffett also made headlines when he said he regretted not investing in Amazon and Alphabet. Starting Monday, Tesla will start kicking out contract workers unless a fulltime employee can vouch for them. In an email to employees, Elon Musk said Tesla employees will need to send HR a note affirming the character of the contractor, or else that person will be denied access to Tesla's facilities. Tesla employs around 40,000 people worldwide. And we speak to Shan-Lyn Ma, co-founder and CEO of Zola, about the company's latest funding round. Zola has worked on improving the wedding registry process for couples. With this new funding, Ma says Zola will work to ensure every part of the wedding planning process is seamless, from budgeting to the honeymoon.