In what kind of crops do they occur? Crop circles have been reported in mostly corn (they are sometimes referred to as "corn circles") and wheat. But, they also appear in barley, oats, rapeseed (canola), grass, flowers, trees, and snow.

Where do they appear? - They have appeared on every continent and been reported in over 70 countries worldwide. The only countries where there have been no reports of crop circles is mainland China and South Africa.

Unbelievably small width of rings - In some of the ringed formations that have appeared since 1990, they have been made with a width of as little as 1"! This is enough to view from the air, but impossible to trace from the ground without stomping on standing crops.

Change to the grain - not only does the physical appearance of seem to change (it looks dehydrated), but when the seeds are planted they grow 40% faster than their normal counterpart from the same field.

Swirl in multiple directions - many formations have complex woven patterns of the swirled crops. Not only do the plants in the formation swirl clockwise or counter-clockwise, but sometimes certain sections will swirl one direction and layers on top are going another direction. They sometimes even have multiple layers swirled in different directions.

Woven stalks - Other times the stalks are actually [*]woven like a piece of loose cloth on the floor of the formation. This has been observed by various researchers in the UK.

Selective swirling - Even though the edges are clearly defined, sometimes stalks from the outside edge are pulled into the formation. This doesn't seem to be too unusual, but actually certain stalks from the middle of a grouping of plants gets pulled in. The ones closest to the formation do not. And this occurs around the entire edge of the crop circle. Very meticulous!

Equipment malfunctions - There have been numerous reports of electronic equipment failng in crop circles and magnets going haywire. No one is able to explain why this seems to occur.

Emit sound at 5khz frequency - Researchers have measured a distinct emission of energy at 5khz eminating from fresh crop circles. This corresponds to reports of eye-witnesses who often claim to hear a "trilling" sound coming from the direction of the formations- in-the-make.

Formations transform into new patterns - There have been instances where certain formations take on an entirely different appearance as they continue to grow in the field. For example, one formation got a wavy look within the center of the circle that wasn't there originally.

Anomalous measurements - By doing a fluxgate magnetometer survey of several formations, [*]Colin Andrews determined that the very center of these circles measured 40-50 nano Teslas. This is 10 times the radiation level of a normal field.

Group of plants bend at same node - It's a widely publicized fact that plants within a formation actually [*]bend at the naturally occuring nodes 90 degrees, but what isn't well-known is that there are different nodes that they could choose to bend. Plants have several going up their stalks. It was discovered not long ago that various sections of formations can be grouped together according to which node they bend at. Some bend at the knuckle closest to the ground. Yet in a neighboring section they all bend two knuckles up and so on. Yet one thing remains the same, they all still bent at 90%!

Patterns happen around many people - one main point against the hoax theories is that many formations are created near major thoroughfares. They are also produced at night without the aid of any lighting.

Chalk & water underneath - One common denominator of the crop formations is that they occur over underground water supplies and land situated above chalk beds. They conduct the electro-magnet currents of the earth well and appear to have something to do with how they are formed. This are is being researched, though.

Aligned with natural features of the land - This isn't apparent from the ground, but aerial photographs have shown that often formations are imprinted on the earth in alignment with tram lines or even darkened sections on the earth. This is an impossiblity without been able to see "the big picture" before permanently laying out the design.

Sacred geometry - Researchers have discovered layers within layers of information contained in teh crop circles themselves. There are sacred ratios, such as the phi ratio that governs all organic life and diatonic ratios. This is an area that requires more attention and resources since it is impossible to hoax these perfect images.

Physical side effects - Many people mention having some sort of physical reaction (positive or negative) during and after a visit to a crop formation. Side effects range from nausea, headaches, dizziness, pains amd giddiness to getting literally knocked off their feet. There is an individual (Lucy Pringle) who is collecting data from those individuals who experience anything unusual within the formations.

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