Donate SIGN UP

Rev. Green

21 to 40 of 102

First Previous 1 2 3 4 5 Next Last

Avatar Image
Rev. Green

Dual Focus

Is it possible to make a compound camera lens, perhaps using materials like Iceland Spar, which could simultaneously focus comparatively well on two objects, one near, one far, while leaving the...
16:07 Thu 13th May 20212 answers, last by Jonathan-Joe 07:18 Fri 14th May 2021
Avatar Image
Rev. Green

Can Ibm Do Math(S)?

IBM announced that moving from a 5nm process to 2nm allows 50bn transistors on a fingernail-size chip rather than 30bn. But 30bn x (5/2) x (5/2) = 187.5bn not 50bn.
11:08 Sun 09th May 20214 answers, last by ToraToraTora 13:49 Sun 09th May 2021
Avatar Image
Rev. Green

Cuckoos

How does a cuckoo raised in a blackbird's nest know to say "cuckoo" and choose a cuckoo as its mate?...
13:11 Thu 06th May 20216 answers, last by ladybirder 15:44 Sat 08th May 2021
Avatar Image
Rev. Green

Can Space Disappear?

If I understand Steven Hawking, the Big Bang created positive energy (including mass) and an equal amount of negative energy, which resides in space. Can space disappear? For example, can a Black Hole...
11:06 Tue 06th Apr 20219 answers, last by davebro 18:51 Thu 22nd Apr 2021
Avatar Image
Rev. Green

Is The Answer 42?

An infinite number of points A are placed at random on an infinitely long line. A second infinity of points B are also placed at random on the line. How many B's coincide with one or more A's on...
10:12 Sat 06th Jun 202083 answers, last by Rev. Green 21:22 Sun 07th Jun 2020
Avatar Image
Rev. Green

Walk Right

Should we all walk/jog/run in a clockwise direction when there is an alternative return route to avoid those coming the other way? Clockwise is easy to remember: it's the way round a roundabout. Right...
08:46 Thu 26th Mar 20209 answers, last by Spicerack 12:06 Thu 26th Mar 2020
Avatar Image
Rev. Green

Why Not Syphon The Reservoir?

The high-power pumps can empty the reservoir in four months and consume large amounts of energy. A hundred pipes could empty it quicker and cost little.
07:34 Fri 02nd Aug 201939 answers, last by tamborine 11:57 Tue 06th Aug 2019
Avatar Image
Rev. Green

Recycling Plastic

What numbers can I put into plastic recycling? I know that 1 and 2 are okay. Are there others? The council says "anything bottle shaped"!...
20:05 Sun 21st Jul 201913 answers, last by gingejbee 13:17 Mon 22nd Jul 2019
Avatar Image
Rev. Green

Extra Symbols?

Is anyone else irritated by not knowing in The Planets series which scenes are real and which are computer-generated. It would be easy to include an on-screen symbol to tell us which. Wildlife and...
08:26 Tue 11th Jun 201917 answers, last by tiggerblue10 20:02 Wed 12th Jun 2019
Avatar Image
Rev. Green

Inverse-Square Law

Gravity obeys the inverse-square law at ordinary distances. To make it obey the same law at large distances we invent dark matter, and to keep it on track at vast distances we invent dark energy....
08:26 Fri 03rd May 20199 answers, last by mibn2cweus 13:29 Sat 04th May 2019
Avatar Image
Rev. Green

Efficient Swimming

Ducks fly in V-formation to save energy. When swimming, should the V be sharper or flatter? Does it depend on viscosity, or speed of sound in the medium, or both?
15:49 Sat 27th Apr 20196 answers, last by Mamyalynne 16:09 Sat 27th Apr 2019
Avatar Image
Rev. Green

Where Is A Test Card?

Our TV failed after 24 years, so we've coupled the Freeview box to a monitor. The box has five formats, from cinema to square-ish, and the monitor has three formats. Some combinations give tall thin...
09:30 Mon 04th Feb 20192 answers, last by 4candles 11:53 Mon 04th Feb 2019
Avatar Image
Rev. Green

The Times Killer Sudoku 6398 Friday January 18Th 2019

Please tell me the third column to show where I keep going wrong.
09:37 Fri 25th Jan 20192 answers, last by Rev. Green 11:59 Fri 25th Jan 2019
Avatar Image
Rev. Green

How Do Black Holes Swallow Matter?

How do Black Holes swallow matter? They have high gravity, but almost every object that approaches them should go into orbit in the same way that almost everything in the Solar System orbits the Sun....
11:52 Fri 04th Jan 201924 answers, last by mibn2cweus 06:49 Thu 10th Jan 2019
Avatar Image
Rev. Green

When Does Income Become Savings?

If I receive income on Tuesday and give some to my son on Thursday, he never has to pay tax on it even if I die within seven years. If I wait twenty years to give it, it then becomes savings, and he...
09:44 Wed 26th Dec 201815 answers, last by sandrakbush 08:06 Wed 09th Jan 2019
Avatar Image
Rev. Green

Isobar Spacing On Bbc Weather

What is the spacing of isobars on BBC Weather? Is it always the same? It seems about four millibars.
09:40 Thu 29th Nov 20187 answers, last by Rev. Green 19:54 Thu 29th Nov 2018
Avatar Image
Rev. Green

Why Do Trees Have Leaves On The North Side?

Trees are symmetrical. Why haven't some evolved with more leaves in sunlight, the South side in the Northern hemisphere.
10:37 Tue 20th Nov 20187 answers, last by jno 17:32 Mon 26th Nov 2018
Avatar Image
Rev. Green

Jewellery Indexation

I need the current value of a brooch which was valued at £100 in 2005. Is the indexation value available anywhere?...
16:18 Sun 14th Oct 20182 answers, last by ToraToraTora 16:25 Sun 14th Oct 2018
Avatar Image
Rev. Green

How Do Gravitons Leave Black Holes?

How does a black hole attract matter if nothing, except a small amount of Hawking radiation, can escape?
08:30 Tue 12th Jun 201831 answers, last by jim360 16:33 Sun 17th Jun 2018
Avatar Image
Rev. Green

Telephone On Wifi?

I'd like to buy a better mobile telephone, one which can show email and the odd web page. Can they use the wifi router when at home? It would be good to know what is available before approaching a...
18:30 Tue 03rd Apr 20188 answers, last by Tilly2 18:59 Tue 03rd Apr 2018

21 to 40 of 102

First Previous 1 2 3 4 5 Next Last