Abdominal CT: Computed tomography (CT) uses x-rays to produce detailed pictures of the abdomen, liver, gallbladder, bile ducts and intestine to help identify inflammation of the gallbladder or blocked bile flow. Sometimes (but not always) it can also show gallstones. What is the best test to detect gallstones? Abdominal ultrasound.Read More →
The auroral zone is 3 to 6 degrees wide in latitude. It lies between 10 and 20 degrees from the geomagnetic poles. This is visible quite clearly during the night. Can the aurora australis Cannot be seen from space? While aurora are generally only visible close to the poles, severeRead More →
These invisible wavelengths include ultraviolet (beyond violet) and infrared (below red). Deer sense colors toward the violet end of the spectrum, so they can see blues and probably even ultraviolet (UV) light. What light can deer not see? “Deer are essentially red-green color blind like some humans. Their color visionRead More →
It is proposed that a remarkable sequence of three astronomical events stimulated the journey of the Magi: the triple conjunction of Saturn and Jupiter in 7 BC; the massing of the three planets Saturn, Jupiter and Mars in 6 BC; and finally the appearance in 5 BC of the `starRead More →
Pulsar. Pulsar is any of a class of cosmic objects that emit extremely regular pulses of radio waves; a few such objects are known to give off short rhythmic bursts of visible light, X rays, and gamma radiation as well. … This radiation is released as intense beams from theRead More →
You’ll see a waning crescent moon – sometimes called an old moon – in the east before dawn. On each successive morning, a waning crescent moon will show us less and less of its lighted portion, or day side. … The illuminated side of a waning crescent moon always pointsRead More →
Compared to mitosis, which can take place in a matter of minutes, meiosis is a slow process, largely because of the time that the cell spends in prophase I. During prophase I, the pairs of homologous chromosomes come together to form a tetrad or bivalent, which contains four chromatids. DuringRead More →
Observers can look out for the shower wherever they are, but there are certain kinds of places that will increase your chances of spotting meteors. Plan ahead and check the weather forecast. What direction is best to see Perseids? To see the meteors, look up and to the north. ThoseRead More →
Use only non-comedogenic skin care products and makeup. The word “non-comedogenic” means the product won’t clog your pores. … Cleanse your face twice a day. … Use retinol. … Treat acne. … Protect your face with sunscreen every day. … Exfoliate. … Be gentle with your skin. … Treat saggingRead More →
Tonight after sunset look to the West and find brilliant Venus. Just above the planet is a small cluster of stars called the Pleiades or Seven Sisters. Located in Taurus the Bull, this little cluster is easy to see. What time does the Pleiades rise? For northern hemisphere viewers, theRead More →