What Are the Different Hair Types? Hair comes in four main types: straight, wavy, curly, and coily. Each hair type has its own unique characteristics. The four types are broken down into subtypes (A, ...

Several genes with varying inheritance patterns are involved in determining your blood type. The most significant gene is the ABO gene which determines your ABO blood type. Like many of your physical ...

When we think of personality types, two popular (although not clinical) models come to mind: Type A and Type B. Type A is generally perceived as the overachiever who’s ambitious and competitive and ...