Monday, December 9, 2019
SSC exam calendar 2020-21: Check CGL, MTS, CHSL, JE exam and notification dates
Sunday, December 8, 2019
only legand can find funny
Friday, December 6, 2019
environment health related.
Global warming causing birds to shrink, scientists say
Birds are getting smaller, according to an analysis of migratory birds that died after colliding into buildings in Chicago and were collected as specimens for the Field Museum of Natural History.
David Willard, a Field Museum ornithologist, has measured the Windy City’s dead birds since 1978. Data from his calipers and scales reveal decades-long trends in bird bodies: Their legs, on average, are growing shorter. They have lost weight. Their wings are getting slightly longer.
These changes are present in nearly all of the species he measured, according to a study of 70,716 bird specimens from almost 40 years published in the journal Ecology Letters.
Morphing birds, Mr Willard and his colleagues say, reflect a changing climate.
“Warming temperatures seem to be having a pretty consistent and almost universal effect on a large number of different species, regardless of other aspects of their biology,” said study author Benjamin Winger, who studies the evolution and ecology of birds at the University of Michigan.
The basis for the study began after an acquaintance mentioned to Mr Willard birds often dashed into a glassy convention centre, McCormick Place, near the museum. (The convention centre, the biggest in North America, reduced its nighttime lights about 20 years ago; as a result, bird deaths there have dropped by about three-quarters, Mr Willard said. McCormick Place also recently installed a bird habitat over one of its underground parking garages.)
Climate change was not on his mind, Mr Willard said, when he started gathering the birds to add to the museum’s collection. He measured their beaks, legs, mass and wings – standard ornithological dimensions – because he was curious about seasonal trends.
As the years passed, Mr Willard was joined by other museum staff and a volunteer organisation, Chicago Bird Collision Monitors, which also collects birds harmed by windows. The volunteers rehabilitate injured birds and only donate the departed ones to the museum.
By 2016, Mr Willard had recorded the measurements of more than 70,000 birds, representing 52 species, in his ledgers.
From 1978 to 2016, birds on average lost 2.6 per cent of their mass and their legs shortened by 2.4 per cent. Their wings, meanwhile, lengthened by 1.3 per cent.
“The changes that are being documented are not something you could see with your eye,” Mr Willard said. But that they appear in such a large sample, and one involving diverse bird species, indicates the trends are real and widespread, he said.
Mr Winger said it was unclear whether small reductions harm the birds. “We don’t really know what the biological significance is, of this difference,” he said.But this observation was potentially concerning to Mr Griffith, who compared this with other broad-scale patterns in birds, like the recent study reporting the 29 per cent decline in North American bird populations since 1970.
Thursday, December 5, 2019
PROGRAMMING IN C TO PRINT DIGIT OF ENTERED NUMBER IN REVERSE ORDER ?
C program to reverse a number
Avneet Kaur v/s Jannat Zubair
Avneet Kaur v/s Jannat Zubair: Who rules the digital world?
ssc chsl official notification is out check every thing about ssc and much more.....
SSC CHSL Tier I computer-based test will be held in March, tentatively between March 16 and 27, 2020
CHSL 2019: Pay scale

be filled on the official website of the Commission at ssc.nic.in.




