Polarimetric imaging can uncover features invisible to human eyes and conventional imaging sensors, and it is becoming an ever more essential technique in modern society. Conventional polarimetric imaging systems require ...
Optics & Photonics
Sep 18, 2023
0
43
Being able to read others' affective states and intentions from facial expressions is crucial for social interaction. Nonhuman primates share the same ability as humans to express emotions via facial expressions, yet we are ...
Plants & Animals
Sep 15, 2023
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1
This year's string of record-breaking disasters—from deadly wildfires and catastrophic floods to record-high ocean temperatures and record-low sea ice in Antarctica—seems like an acceleration of human-induced climate ...
Earth Sciences
Sep 14, 2023
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16
Approximately every 80 years, a faint 10th magnitude star in the constellation of Corona Borealis dramatically increases its brightness. This star, T CrB, is known as a recurrent nova and last flared in 1946, peaking at magnitude ...
Astronomy
Sep 11, 2023
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50
Astronomers have discovered the first "bubble of galaxies," an almost unimaginably huge cosmic structure thought to be a fossilized remnant from just after the Big Bang sitting in our galactic backyard.
Astronomy
Sep 10, 2023
1
238
A newly discovered comet is swinging through our cosmic neighborhood for the first time in more than 400 years.
Space Exploration
Sep 7, 2023
0
1162
A comet called Nishimura discovered just a month ago could be visible to the naked eye this weekend, offering stargazers a once-in-a-437-year chance to observe the celestial visitor.
Space Exploration
Sep 6, 2023
0
14654
Have you ever accidentally ruined a recipe in the kitchen by adding salt instead of sugar? Due to their similar appearance, it's an easy mistake to make. Similarly, checking with the naked eye is also used in chemistry labs ...
Analytical Chemistry
Aug 30, 2023
0
16
When astronauts set off for a trip around the moon in 2024 with NASA's Artemis II mission, they will go primed with knowledge of lunar landmarks gathered by one of the Agency's premiere robotic missions to our nearest cosmic ...
Space Exploration
Aug 29, 2023
0
6
Physicists at St Petersburg University have studied planetary waves and discovered that they can generate disturbances in the stratosphere causing extreme warming and cooling in the Arctic and mid-latitudes. Numerical modeling ...
Earth Sciences
Aug 2, 2023
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1
Eyes are organs that detect light, and send signals along the optic nerve to the visual and other areas of the brain[citation needed]. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates, annelids and arthropods.
The simplest "eyes", such as those in unicellular organisms, do nothing but detect whether the surroundings are light or dark, which is sufficient for the entrainment of circadian rhythms. From more complex eyes, retinal photosensitive ganglion cells send signals along the retinohypothalamic tract to the suprachiasmatic nuclei to effect circadian adjustment.
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