Scientists have for the first time ever filmed a crucial step that leads to new human life – cracking open a ' black box ' of early development, and potentially helping with fertility treatments .

Every human alive today was once nothing more than a free-floating clump of cells looking for a suitable place to call home. Despite the odds, our embryos did it: they became one with our mother's body.

This achievement, known as implantation, occurs deep within the uterus, and until now, scientists had only taken snapshots of the phenomenon.

It takes weeks before an ultrasound can glimpse anything in the darkness.

A new system now lets researchers take a closer look at the surprisingly invasive process. Time-lapse recordings show human embryos in the lab aggressively penetrating a coll

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