for	calculating	height	from	stride	length,	but	it	is	too	inexact	a	science. 	The	same applies	to	foot	size. 	 	 IN	THE	CAR 	 It	is	possible	to	tell	if	someone	just	arrived	at	a	location	by	listening	closely	to their	car. 	If	you	can	hear	crackling	noises,	the	passenger(s)	must	have	arrived within	minutes	ago. 	The	crackling	is	due	to	the	hot	metals	inside	the	car	cooling off	and	expanding/contracting. 	 License	plates	have	the	last	two	digits	of	the	year	they	were	purchased,	and	some have	the	month	as	well. 	 If	a	person's	rear	view	mirror	is	angled	downward	toward	the	back	seat,	it	is likely	the	owner	has	children,	and	that	those	children	are	small 	and	require supervision.