Researchers compared two methods of freezing mouse embryos: traditional slow freezing and a new technique called minimum volume Spatula MVD vitrification. They found that using the new vitrification method resulted in better survival and development rates for both in vivo (from the mother) and in vitro (in a lab dish) produced embryos. The vitrified embryos had higher survival rates compared to frozen embryos, leading to similar pregnancy and offspring rates as fresh embryos when transferred to surrogate mothers. This study suggests that the minimum volume Spatula MVD vitrification method is a simple and effective way to preserve 2-cell and 8-cell mouse embryos for future use.