Reading Time: 2 minutes Things to pay attention when we are over 50 (I borrowed this paragraph from a high school classmate in mailand CHN) 我来说几句吧，不妥之处请大家指正：1. 一定要有医保，有能力的可以适当配点商业保险 2. 同学们都巳年过半百了，各种慢性病会慢慢出来，应该学习一点医学常识。个人建议关注以下几个（微信）公众号： 丁香医生/ 菠萝因子/ 营养师顾中一 Below is my own cooking Exercise 锻炼身体：running, jogging, and walking 跑步，慢跑，走路 are all good. Many other good cardiovascular exercise 心血管运动 include cycling, swimming, and tennis. Take your
Reading Time: 2 minutes I was working on a new app and this app has something to do with timing. Basically I need to record the time between a button being displayed and the time a user touches the button (note they are in two different functions). NSDate and memory leak To accomplish this, I am using NSDate class,
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