I had a healthy pregnancy and gave birth to a healthy baby in January 06 than miscarried at 8 weeks in June 07. I havent heard of many people having normal pregnancies and then a miscarriage. Has anyone experianced this and if so did you go on to have another normal pregnancy?

A: I had a very healthy normal by the book pregnancy giving birth in '98 and then two yrs later miscarried in the 2nd trimester. Three months after that I got preg with my second and again had a text book pregnancy giving birth in '00. We are on our third viable preg now. It is amazingly very typical to miscarry. When we did, I did a lot of research trying to find a cause and found out that 1 in 10 pregnancies will have an outome of miscarriage. It is on the rise not because woman...

The earth experiences seasons because it is tilted on its axis; how normal is this as far as other planets are concerned? Is it normal for planets to be a little cockeyed or does that distinction make the earth a "lefty" in astronomy?

A: Mars has seasons too, actually it has slightly more tilt than we do. Venus is not only extremely tilted but also spinning backwards however the atmosphere is so screwed up that the seasons aren't noticeable. Mercury is the least tilted of all the rocky planets.

The early solar system was a violent and random place. For example Venus probably acquired it's tilt and backspin the same way a struck cue ball might in pool; something else seems to have hit it. The Earth was...

What is the difference between normal and non normal distributions. I know normal data have a bell shaped curve, but what about when they don't. Does that mean the data should be transformed?

A: Normal distribution refers to Gaussian distribution. Non-normal would refer to any other type of distribution, such as Bernoulli, binomial, logistic, log-normal. These other forms don't have the bell shape you describe for gaussian distributions.