Why do boiled eggs sometimes Crack How can you reduce or avoid it?

Online Answer
As you cook the egg the air bubble expands and cracks the shell. To prevent the shell from cracking, gently pierce the air bubble with a sharp, pointy knife. It allows the expanding air to escape. I disagree with comments from Jefromi, for one..
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Bacteria can enter eggs through cracks in the shell. Never purchase cracked eggs. However, if eggs crack on the way home from the store, break them into a clean container, cover tightly, keep refrigerated, and use within two days. If eggs crack during hard cooking, they are safe.
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