Time: 02:10CR - school - chemistry - laboratory - test tubes - sodium explosion
Time: 15:31CR - industry - science - chemistry - laboratory - scientist - flask - test tube
Time: 02:27CR - education - school - chemistry - physics - test - experiment - liquid nitrogen
T|ime: 06:14CR - education - school - medical - chemistry - anatomy - test tube - plastic model
Time: 03:30CZ - education - Brod - laboratory technician - chemistry - experiment - test tube - burst
Time: 10:35CZ - education - Ledeč - observatory - telescope - microscope - chemistry - experiment - mathematics - Guinea pig
Time: 10:16CZ - education - Ledeč - telescope - microscope - chemistry - try - walking belt - reader - robot CNC