Cramer's lightning round: Upwork is a 'terrific idea'

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Upwork: "I think it's a terrific idea."

3D Systems: "It's back. 3D Systems is real."

Rocket Companies: "We're not playing that short-squeeze game. That was a one and done and, frankly, if you like mortgages and you like Rocket, that's fine, but we certainly never want to buy a stock because we think that the shorts are going to be on the run."

Danimer Scientific: "I am inclined to like this, but so far there's never been a real successful biodegradable that can scale, and that's one of the reasons why, oddly enough, that Dow Chemical continues to do so well. I think it's interesting, it's intriguing, but please it is just a spec, nothing more than that."

NortonLifeLock: "I do like the franchise and I think it's got a good brand name."

LHC Group: "I always default to Centene."

Disclosure: Cramer's charitable trust owns shares of NortonLifeLock.

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