Boiled egg charts don't seem to work right in my house. They promise a medium boiled egg (runny yolk, firm white) at 6 min, but the last time I put eggs into boiling water & took them out after 6 min., they were very soft boiled, with mostly wet & slimy whites. Yuck! I suspect there are a lot of embedded assumptions in the chart, e.g. how big are the eggs? how fresh are they? have they been sitting in the fridge or at room temp? It's so disappointing when eggs turn out badly.