...I just wanted to make clear that however this may not seem to fit current understandings, the scientists who are warning about the cellphone connection are not simply guessing.
I think they have evidence that placing a cell phone near the entrance to the hive will make the bees have difficulty in returning, but think that true even if the batteries were dead. Bees are very confused by even slight visual changes in the last foot or so of their "landing approach."
One winter I put a brick on the lip of a hive to reduce the entrance slot. (It is about 1/4 th inch tall and 15 inches wide.) I knew they eat honey to stay warm and make it thru the winter. - I thought this would reduce the cold air entering, but that hive almost did not make it thru the winter. The bees do go out even in winter to "go to the bath room" and quickly return. The brick on the entrance lip must have changed the local visual impression so that it did not conform to their memorized pattern and many could not find their way back into the hive before the heat lost to the cold air made them flightless.
While the angle to the sun is their many reference for most of their flight, the final approach is by vision, but their vision is very differ from creatures with image forming lenses. - Basically it measures the light intensity coming from different directions without any image.
If you move the hive only two feet sideways in summer, when many bees are out, you will soon have a swarm of confused, nectar-laden, returning bees in front of the old location! - They can not see the hive only a foot away and nothing matches the memorized pattern of light intensity vs angles. Most wander arround confused and by chance get in front of the hive and close enough to it for it to dominate the solid angle "forward" visual pattern and then they fly straight in, no longer confused.
I have not read the report of the experiment, but if they did not compare the cell phone with no battery case to the cell phone with battery case (and I doubt they did) then their results may be nonsense - due to little understanding of how bees find the hive entrance.
I would be interested to know if they did the experiment correctly (had the no-battery cell phone case) It is not unusual for some disease to spread. Bees will try to steal honey from other hives and those that do get past the guard bees carry the infection into the other hive. I bet this is the reason many hives are dying.
BTW - I am strongly of the opinion that it is the hive that lives (or dies). I.e. that bees are just individual specialized "cells" in this hive organism, just as your liver cells are specialized parts of you, the living organism.
Individual bees have specialized jobs (but a set of different ones as they get older.) I put some flour on a few of the bees doing "ventilation duty" (wings furiously beating and feet griping the landing lip) one warm summer day when going into the woods to cut some fire wood. - They were still on duty a couple of hours later when I returned to look. I think that these "cells" of the "living hive body" are specialized into at least two dozen different tasks, like you have liver, teeth, retina, etc. specialized cells.
I again recomend you keep a hive of bees if you can. Very interesting and rewarding project if you read, study and experiment with them. As told in prior post, I started keeping bees for tax reasons, just as about two years ago I started to teach myself some thing about detailed biochemical mechanism of human cells for investment reasons. In both cases, the side effect of learning are more rewarding than the financial gains I acheived. (I am vey frugal, not interested in owning things etc. so making money is just a game and benefit to my grandchildren - might not do it if it were not excuse for learning.) - I am building a house by myself near a lake. (Why I am not active here on Mondays and Tuesday if there is no rain forcasted for the lake area.) As I work slowly (and completely stop to watch birds, sail boats, wild animals, even ants! etc.) it will be at least five times more costly that if I hired someone to do it, but it gets me out of the pollution of Sao Paulo and makes me do hard manual labor, which I would not otherwise do, and few my age can do. Also it has many strange features, which would be difficult to tell (in portuguese) to a hired laborer, I have been at it for 5 years now, and it will take another 10 before all the roof is on, still no windows or wiring etc. - I doubt if I can live long enough to finish it all - would be at least 120 before final coat of paint etc.
My philosophy in life is that the destination (the grave) is not important, or even desirable, but the journey is the important thing.