Here's why:
* Different Structures: Hair and eyelashes, while both made of keratin, have different structures and growth patterns.
* Genetics: The shape and curl of your eyelashes (and hair) are largely determined by your genes.
* Other Factors: Factors like age, hormones, and even the way you apply mascara can influence eyelash curl.
In short, straight hair doesn't guarantee straight eyelashes, and vice versa.