The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

However, did you know a lot of the bots you have been using are actually examples of artificial intelligence? The bot has been designed to mimic human-like responses and perform a variety of tasks.

Type 4 hypersensitivity is the second most common type of reaction. This type of reaction takes two days or more to develop. An example of this reaction is a rash to poison ivy. Type 3 is an ...

Previous experimental studies have suggested that the force applied by the ball to the system accelerates the chemical reaction, but it is not well understood how macroscopic forces influence ...

Precipitation change and grazing are the main factors influencing vegetation structure and dynamics in semi-arid grassland. However, the effects of precipitation variation and livestock trampling on ...

Both moist heatwaves (HWs) and heavy precipitation events (HP) have increased in both frequency and magnitude over China in recent decades. However, the relationship between HW and HP and changes in ...