Two times five (2 x 5)

Alpine flowers
A pair of flowers. I took this photo while camping high up (ca. 2000m asl) in the Haute Savoie Alps in 2019 and thought they were lovely.
They inspired this page.





2 x 5 element yagi
Five element yagi antennas provide useful gain, good front to back ratio, useful directionality and seem to have a lovely symmetry and elegance.
I have used a 5 element design for the 2m band with great success at home and portable antenna for over 30 years.
It's become a sort of standard I use to compare the antennas I make. Two can be phased together to create an even more interesting antenna.
One wavelength spacing results in a rugged lightweight antenna array that has a very small turning circle, provides a useful gain (ca. 10 dB over a dipole) with a nice clean pattern.
To my eye it looks lovely.







Two x five club juggling
To be able to juggle five balls or clubs is a real bench mark.
So to see two people each jugging five clubs perfectly synchronised is really quite amazing and very beautiful.
Click here to view a YouTube video (about 3 min in) PILIPOVICH And MJAGKOSTUP - Moscow State Circus - Circa 1988






Two transistor flip-flop (2 x 5 = 10 components)
The flip-flop or multivibrator, is an important electric building bloc.
It forms the heart of oscillators and memory circuits in computers and is used in synthesisers and many other electronic devices.
The simplest arrangement is composed of two mirror image circuits with cross over wiring.
For a two led oscillator we have: two transistors, two leds, four resistors and two capacitors: 2 + 2 + 4 + 2 = 10).





Ferrocene
Two pentagon (5 carbon atom) rings spaced apart with an iron ion centrally placed between them. The iron in the center is in +2 oxidation state. Each cyclopentadienyl (Cp) ring is allocated a single negative charge. Ferrocene was discovered by accident thrice (see wiki page). The rapid growth of organometallic chemistry is often attributed to the excitement arising from the discovery of ferrocene and its many analogues (metallocenes).





C₆₀ point of inversion
Starting from any atom, you can draw a line through to the center and out the same distance the other side and it will pass through another atom.
This symmetry property is known as a point of inversion (I). Any two opposite (inverted) atoms are also each in a pentagon.

THE CREATIVE SCIENCE CENTRE

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