What hides this stereogram?
[3076] What hides this stereogram? - Stereogram - 3D Image - #brainteasers #stereogram #3Dimage
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What hides this stereogram?

Stereogram - 3D Image
#brainteasers #stereogram #3Dimage
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What is sex?

An 8-year-old girl went to her dad, who was working in the yard. She asked him, "Daddy, what is sex?" The father was surprised that she would ask such a question, but decides that if she is old enough to ask the question, then she is old enough to get a straight answer. He proceeded to tell her all about the "birds and the bees." When he finished explaining, the little girl was looking at him with her mouth hanging open. The father asked her, "Why did you ask this question?" The little girl replied, "Mom told me to tell you that dinner would be ready in just a couple of secs."

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Metric System

In 1960, the fourth legal definition of the metre was made to be 1,650,763.73 wavelengths in vacuum of the orange-red light radiation of the krypton-86 atom (transition between levels 2p10 and 5d5). It was adopted at the 11th meeting of the Conférence Générale des Poids et Mesures (CGPM), which also specified the seven basic units of the SI system. It was superceded by a fifth definition of the metre on 20 Oct 1983, based on the speed of light. The definition in terms of wavelengths of the kryton spectral line wasthen100 times more accurate than the previous third legal definition adopted in 1889. (The third legal definition on 28 Sep 1889, was based on the distance between two reference markson the International prototype metre bar, made of platinum-iridium, (90% Pt, 10% Ir), cross section X, at a 0 °C temperature.)«[Image: Krypton-86 gas excited by high-frequency oscillator, in a vessel cooled to the temperature of liquid nitrogen to produce precise monochromatic radiation. The special lamp is placed in front of an interferometer calibrated in wavelengths.]
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