What causes trichromatic vision?

What causes trichromatic vision? The normal explanation of trichromacy is that the organism’s retina contains three types of color receptors (called cone cells in vertebrates) with different absorption spectra. In actuality the number of such receptor types may be greater than three, since different types may be active at different light intensities. What causes Tetrachromatic […]

Why is south facing garden better than north?

Why is south facing garden better than north? The main advantage of a south-facing house or garden is the amount of sunlight you’ll enjoy. As the sun rises in the east and sets in the west, the south side of any house will see the most hours of sunlight during the day – especially in […]

Is it a good idea to stretch sore muscles?

Is it a good idea to stretch sore muscles? “Stretching helps break the cycle,” which goes from soreness to muscle spasm to contraction and tightness. Take it easy for a few days while your body adapts, says Torgan. Or try some light exercise such as walking or swimming, she suggests. Keeping the muscle in motion […]

How long is the fall equinox?

How long is the fall equinox? 12 hours What happens on the autumnal equinox? Autumnal equinox, two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the […]

How long does DNA under your nails?

How long does DNA under your nails? Although foreign DNA may persist under fingernails in a harsh environment for up to 48 h [2, 11, 12], Matte et al. [7] found that even after the deliberate deposition of cellular debris through scratching, foreign DNA rapidly decays beyond 6 h. How are fingernail scrapings packaged? This […]

Can I use 100x without oil?

Can I use 100x without oil? Never use the 100x objective without using immersion oil. When you have correctly brought your slide into focus up to 40x (step 3), then: a. Turn the nosepiece half-way between the 40x and 100x objectives. Immersion oil should never be put on any other objective than the 100x! What […]

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