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CROSSWORD HANDBOOK
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Crosswordist's Handbook / Index

Crosswordist's Handbook

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Biology, botany, zoology / Zoology / Extinct horses

(6)

TARPAN - the ancestor of the horse

(8)

EOGIPPUS

(9)

Anchiterius

GIPPARION

MERINIPUS - fossil horse

MYOGIPPUS

(10)

MESOGIPPUS

PARAGIPPUS

PLYOGIPPUS

(11)

HYRACOTERIUM (chirocaterium)

MERIKGIPPUS

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Random news from the Archive

Ink changes color 29.04.2003

New inks have been developed that can change color. In the future, thanks to them, it will be possible to create newspapers containing moving images, or, for example, indicators of chemicals that change their color in different chemical environments.

A substance called "light ink" was developed by D. Ozin and J. Manners from the University of Toronto (Canada). The ability to emit light of all shades of the spectrum is determined by diffraction. The ink contains spherical particles of silicon dioxide with a diameter of about 0,3 microns, constituting ordered structures. Due to interference processes in the light reflected from them, the radiation of certain wavelengths is attenuated, as a result of which the reflected light acquires a certain color.

To adjust the color ink to a certain color, a polymer gel was introduced into the ink composition. Under the action of the solvent, it swells, and when it dries, it shrinks. Changing the state of the gel (this process takes only 0,5 s) allows you to change the color of the ink. The gel also conducts electricity, and the electrical potential applied to it determines the amount of solvent that the gel is able to absorb.

As a result, a change in the electric potential applied to such inks allows their color to change smoothly over the entire spectrum.

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