You may also like  problem icon  Far Horizon   problem icon
Epidemic Modelling   problem icon  More or Less?  Are these
estimates of physical quantities accurate?  Biology Measurement
Challenge    Consider these objects, images for which are given
below:    1. Mitochondria   2. Arabis voch pollen   3. Ring
stage of Plasmodium falciparum   4. Tuberculosis bacterium   5.
Human red blood cell   6. Human nerve cell   7. The eye of a
needle   8. Cat hair   9. Snowflake crystal  How many do you
recognise? Can you put them in order of length? Cross-sectional
area? Volume? Once in order, how many of the smaller objects
would fit into the larger objects? Discussion point: What
measurement difficulties does this task raise? You can see the
images, some of which contain scale information, below
Mitochondria, mammalian lung - TEM (2)  Arabis voch pollen
Arabis voch1-1  Ring stage of Plasmodium falciparum  Plasmodium
falciparum in Red Blood Cells  Tuberculosis bacterium
Mycobacterium tuberculosis 8438 lores  Human re