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- Electron microscope (5936 bytes)
5: ...s built in [[1931]] by [[Ernst Ruska]] and [[Max Knoll]] at the [[Berlin]] [[Technische Hochschule]].
8: ...a resolution of about 0.2 [[micrometer]] (200 [[nanometre|nm]], whereas electron microscopes can have ...
22: ... temperatures, that the water forms [[vitreous]] (non-crystalline) ice. This preserves the specimen in...
24: ...an embedding medium such as [[ethanol]] or [[propanone]].
34: ... air would scatter the electrons. This means that no living material can be studied. Recent advances h... - Wonders of the Ancient World (11560 bytes)
3: ...even Wonders of the Ancient World]] is the first known list of the most remarkable man-made creations ...
8: ...ly lists of Seven wonders but their writings have not survived, except as references. The seven wonder...
20: ...dle Ages]]—by which time many of the sites were no longer in existence. Today, the only ancient wor...
24: ...enment]]-era, and the concept of a Middle Age did not become popular until the 16th century. Brewer's ...
26: ...ames such as Wonders of the Middle Ages (implying no specific limitation to seven), Seven Wonders of t...
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