Should you buy an unlimited-ride Metrocard?

Unless you count a three-month internship in college, I've never lived in New York City. But, between friends and work, I've managed to visit every couple years or so and I've nearly always picked up an unlimited-ride Metrocard for my week in town. Turns out, choosing to do so is an excellent example of Maggie not being super great at math. Michael Moyer has plotted out the numbers on unlimited-ride Metrocards. He says the purchase only makes sense if you're riding a lot—averaging 14 rides a week for the 7-Day-Pass or 12 rides a week for the 30-Day-Pass. Any less and you're actually better off paying a la carte.

Amtrak users, rejoice! Smartphone scans soon to replace paper tickets.

In the New York Times, Brian X. Chen reports on Amtrak's plans to use Apple iPhones as an electronic ticket scanner on several routes, including Boston, MA to Portland, ME, and San Jose, CA, to Sacramento, CA. "By late summer, 1,700 conductors will be using the devices on Amtrak trains across the country," and passengers can choose to print tickets or display a bar code on their smartphone screens for conductors to scan.