why some things catch on, and others don't / why some things catch on, and others don't why some things catch on, and other don't Trade-off :：why some things catch on, and others don't / why some people have it and others don't Why some people have it--and others don't / why some people have it and others don's Why some teams pull together and others don't / 权衡：你的产品要的是体验，还是便利？：why some things catch on, and other don't why some ideas survive and others die /