15 cm
It grows about 24 cm.
Three Months.
2 cm
about .5 cm a month. but if your older it could be less.
A stalactite is very much slower.
About 4 months
3 cm roughly
.3*30= 9 mm = .9 cm
Round about 80-90 cm give or take : D
It is unlikely that dirt helps your hair grow faster as it damages your hair and cause it to fail out. Dandruff has not effect on hair per se, but can cause intense itching which can pull out hair when you physically attack the itch. So the answer is no, it doesn't. ---- No
Beacuse there trying to look cool