As we get some distance past the critical dates, more and more stories of the design of the technology that has changed the world are coming out. Now it’s the turn of Leander Kahney to look at the iPad: One incentive to move forward was the appearance of netbooks, a category of small, inexpensive, low-powered laptops that launched in 2007. They quickly started to eat into laptop sales and, by 2009, netbooks accounted for 20 percent of the laptop market. But Apple never seriously considered making one. “Netbooks aren’t better than anything,†Steve Jobs said at the time. “They’re just