What is a rosin?

I’ve heard about rosin as a type of cannabis concentrate. Can someone explain what it is, how it’s made, and what sets it apart from other concentrates?

LED vs. HPS lights?

I’m setting up an indoor grow room and I’m not sure whether to use LED or HPS lights. What are the advantages and disadvantages of each type?

Cannabis Polyploids

What are cannabis polyploids and how are they created? What are the potential benefits and drawbacks of using polyploids in breeding programs?

What are the best strains for relaxation and sleep?

I have trouble falling asleep at night and am looking for a strain of cannabis that can help me relax and get a good night’s sleep. Are there any strains that are known to be particularly effective for this? Also, what should I know about dosing and potential side effects?