I haven't seen anyone comment yet about an interesting angle to this story - what the author considers to be the main source of the problem: "Half the male fish in British lowland rivers have been found to be developing eggs in their testes; in some stretches all male roaches have been found to be changing sex in this way. Female hormones - largely from the contraceptive pills which pass unaltered through sewage treatment - are partly responsible, while more than three-quarters of sewage works have been found also to be discharging demasculinising man-made chemicals. Feminising effects have now been discovered in a host of freshwater fish species as far away as Japan and Benin, in Africa, and in sea fish in the North Sea, the Mediterranean, Osaka Bay in Japan and Puget Sound on the US west coast."

Granted, MegaBloks don't hold together at all, but sometimes this is a plus. MegaBloks worked better for us in the toddler years, when the child's goal is simply building and destroying basic towers. Duplo was actually frustrating for our toddler - the building process could get your fingers pinched and the structures were far too well assembled to allow for satisfying destruction. As you move further into the preschool and design becomes a consideration, that's the time to move to the far superior Duplo/Lego sets.