Compass and pencil
Compass and equation
Icelandic Weather
mathematical blackboard
Algebra
Math on blackboard
3d pie graph
Business
Sales
California Wind Farm
Spring composition
Blue and grey  striped background with banner
Variable fighter
Variable resistors
Variable resistors
Variable resistor
Username and password variables in Javascript
details of a variable resistors, trimmer
Drill
water drops on aubergine
Gerber Daisy Row
Falling Daisies
Falling Gerber Daisies
Smiling scientific researcher
Pipetting - dispensing fluid