Define porphyry stone. Learn how its unique, two-stage geological formation creates a distinctive texture and the extreme durability required for historical paving and modern use.
Explore the polarity of $\text{AlCl}_3$. Learn how molecular geometry dictates symmetry, and why its tendency to dimerize complicates the simple answer.
Unravel the unique anatomy of octopus digestion, detailing the stomach's surprising central location and its complex path that requires passing directly through the brain.