Wikipedia:Reference desk/Archives/Science/2021 March 3

= March 3 =

Is there a sea in europe of which its color is green rather than blue?
ThePupil (talk) 09:31, 3 March 2021 (UTC)
 * The apparent color of a body of water will depend on various factors, including what's in it, and what the sky looks like that day. ←Baseball Bugs What's up, Doc? carrots→ 09:51, 3 March 2021 (UTC)
 * To expand on that, if the water is clear, then it will look bluish (especially if the sky is blue too), as water absorbs red light and scatters and transmits blue. Sediment or algae in the water tend to absorb other colours, making the water look more green (or brown, or grey).  See Ocean colour for a summary, or here for more detail. The sea around the UK often looks greenish (or greyish) due to sediment in the water and an overcast sky. Iapetus (talk) 10:35, 3 March 2021 (UTC)
 * Colour variations are probably better expressed in smaller bodies of water with particular conditions, such as at the Blue Pool in southern England, where the colour varies between "red-brown, through grey and green, to the more typical turquoise". PaleCloudedWhite (talk) 12:31, 3 March 2021 (UTC)
 * The Irish Sea is often very clear and appears blue, particularly on the Scottish coastlines, and in north Wales. Rhythdybiau (talk) 18:12, 8 March 2021 (UTC)

Why coronavirus Indian vaccine “Covishield” is more demanding than “pfizer” which has more efficacy?

 * India has undertaken contractual supplies of coronavirus vaccines to Saudi Arabia, South Africa, Brazil, Morocco, Bangladesh and Myanmar, the Ministry of External Affairs (MEA) said in New Delhi on Friday.

Source Why coronavirus Indian vaccine "Covishield" is more demanding than "pfizer" which has more efficacy ? Rizosome (talk) 12:05, 3 March 2021 (UTC)
 * What do you mean by "more demanding"? If you saw the expression somewhere then please link to it. It's not used in your link. PrimeHunter (talk) 13:05, 3 March 2021 (UTC)
 * I'd guess that by "more demanding" what's meant is "in greater demand". Deor (talk) 18:51, 3 March 2021 (UTC)
 * Maybe, but a story about some poor countries getting a cheap vaccine doesn't indicate a greater demand. Looking at other posts by Rizosome, I guess we shouldn't expect much. PrimeHunter (talk) 19:16, 3 March 2021 (UTC)
 * Covishield is the Indian name for the Oxford–AstraZeneca COVID-19 vaccine. It is easier to store and distribute than the Pfizer–BioNTech COVID-19 vaccine which needs to be stored at very low temperatures. The Indian-developed Covaxin has been criticised by some because it was approved for emergency use by the Indian regulator before the clinical trials had been completed. See BBC - Covaxin and Covishield: What we know about India's Covid vaccines. Initial doubts about the effectiveness of the AstraZeneca vaccine in the elderly have been dispelled by recent data from the UK where it has been widely used; see Pfizer, AstraZeneca COVID-19 vaccines may offer high efficacy in elderly. Alansplodge (talk) 15:01, 3 March 2021 (UTC)