the tobacco problem: what do you think? - part 12 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:33
the tobacco problem: what do you think? - part 11 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:31
the tobacco problem: what do you think? - part 10 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:31
the tobacco problem: what do you think? - part 9 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:34
the tobacco problem: what do you think? - part 8 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:29
the tobacco problem: what do you think? - part 7 of 28. presents historical perspective and timely data on the smoking habit and health risks. although ad campaigns continue to glamorize smoking, researchers demonstrate that heavy smoking now is known to - mucus cilia stock videos & royalty-free footage00:33
life story of the oyster - part 8 of 18. shows how the free-swimming oyster larva develops into an adult attached to objects in shallow waters of the ocean. the film notes the place of this well-known mollusk in the marine food cycle - mucus cilia stock videos & royalty-free footage00:26