In the past 100 years, a discovery that really influence my life is the software 'Wechat'.  Scientists discovered it five years ago, as they wanted to figure out something to provide convenience for people's life. As all of the Chinese know, 'Wechat' is today's most popular communication app in China, it provides us free 'FaceTime function', to let us chatting with our friends online, at any time we want, even my friends and I are in different countries. Also, you can post your photos everyday, to let others know how is your daily life looks like. Others may comment and repost your post if they want to. Moreover, the funniest thing about this app is, you can call for food delivery to your home. It fits with the trend of Chinese people's living habit, most of them are too busy at work, so they don't have time to cook by themselves. Then, 'Wechat' will be a tool for them to get food quickly and cheaply. That's the reason why there are so many people using it in China. Finally, you can use 'Wechat' to call for taxi, that is common in China, since the people that are living in China usually don't buy a car. In that case, taxi is the best transportation tool for them. 

So I really appreciate the discovery of 'Wechat', and I love it so much.