user: What is the difference between stress and strain?

assistant: Stress is calculated as the pressure applied per unit area. So stress is essentially the force applied to an object divided by the cross sectional area of where the force is being applied to.

Strain is calculated as the change in  parameter value (length, height or angle) as it experiences stress. It is unitless. So strain is essentially the deformation that occurs due to the stress that is applied.

Young's Modulus is a mechanical property that is computed by dividing stress over strain. It is typically expressed in GPa (giga Pascals)

user: What are the best woods for smoking?

assistant: Oak is the quintessential go-to for smoking meat. It is a great place to start if you are a newbie to smoking.  It will lend a medium to a strong flavor that is seldom overpowering.
	- Best Meat to Smoke: Lamb, beef, brisket, and sausages
	  
Hickory is the most versatile choice as it can be used to smoke wood in many ways. Be careful, though, because too much hickory flavor will cause your meat to have a more bitter flavor. It has a sweet, savory, and hearty, a bit bacony.
	- Best Meat to Smoke: Larger cuts of ribs and pork shoulders, as well as almost all red meat and poultry.
	  
Maple is one of the most subtle smoking wood, it will impart a more subtle smoke flavor.  Use maple for a sweet, light, mild smokiness.
	- Best Meat to Smoke: Poultry, pork, game foul
	  
Mesquite is a hardy wood packing intense flavor. It is recommended for grilling, or to be used in smaller quantities. It is famous for its strong, intense, and unique.
	- Best Meat to Smoke: Red Meat and for adding additional flavor when grilling

Pecan will lend a rich, sweet, nutty flavor. In fact, the wood is so sweet that you may want to use a combination of it with another harder wood to balance out the flavor.
	- Best Meat to Smoke: Briskets, roasts, and ribs
	  
Applewood is mild and sweet, lending a mellow flavor. Apple smoke flavors take a while to permeate the meat, so anticipate several hours of smoking.
	- Best Meat to Smoke: Chicken, wild foul, pork
	  
Alder has a very light and sweet flavor profile. It lends a delicate and sweet characteristic.
	- Best Meat to Smoke: Fish, like salmon and other Pacific Northwestern types.
	  
Cherry is mild and fruity, and when mixed with other hardwood like hickory, the two flavors compliment each other for an amazing result.
	- Best Meat to Smoke: Chicken, turkey, ham

user: Please give a brief history of AI.

assistant: The 1956 Dartmouth workshop was the moment that AI gained its name, its mission, its first success and its major players, and is widely considered the birth of AI. In the 1970s, AI was subject to critiques and financial setbacks. AI researchers had failed to appreciate the difficulty of the problems they faced. In the 1980s a form of AI program called "expert systems" was adopted by corporations around the world and knowledge became the focus of mainstream AI research. In the first decades of the 21st century, access to large amounts of data (known as "big data"), cheaper and faster computers and advanced machine learning techniques were successfully applied to many problems throughout the economy. By 2016, advances in deep learning (particularly deep convolutional neural networks and recurrent neural networks) drove progress and research in image and video processing, text analysis, and even speech recognition.