An amount/number of something
Quantitative describes the quantity of something
Qualitative describes the quality of something
The difference between wakeboarding and snowboarding is in snowboarding you steer with your back foot. It will take some getting used to, but generally, lean on your front foot and you swing your back foot to change edges.
Answer: According to the speaker, headlines about the benefits of chocolate and cheese came about when the scientist was doing studies with a drink that made people have less tryptophan in the brain.