Tonics Tea Cakes Aren't Allowed in Art Planes

A tonics tea cake is like a biscuit base, then a dome of marsh mellow. The and they're made in scotland. Their kind of a famous scottish delicacy. This fact came from a recent interview iam in a number of newspapers by squadron leader tony conan. And he said that he and his colleagues were flying with tea cakes,. They realized that they'd expand and when the pressure changed,  and so they'd be able to tell the altitude they were at depending on how big their tea cakes were. About 15 thousand feet, the tea cape would expand sufficiently to crack the chocolate shell. So you can't take them up any more