What was up with Wall St. and Twitter: Podcast

SAN FRANCISCO - This week in our tech podcast: Marco della Cava imagines a world of self-parking cars where 20-somethings never need drive at all.

It took just two questions to set Penn and Teller off and running for half an hour--what does magic mean in a world full of remarkable artifacts?

And what was Wall Street smoking when Twitter's earnings report came out? Reporter Jessica Guynn and columnist John Shinal discuss, in many more than 140 characters, the somewhat mystifying demands of the Street,

Finally, San Francisco bureau chief Jon Swartz spent several interesting days hanging out with John McAfee, the famously brilliant, if perhaps slightly paranoid, tech entrepreneur.

Swartz talks about seeing a lot of guns and a lot of the South in his several cross-state drives with McAfee last week.