A light linen would be best used for which of the following? A. a pair of suspenders
B. a formal gown
C. upholstery for a couch
D. a skirt for summer

He developed the concept of linear perspective, and he had the ability to solve architectural problems using mathematics.

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.