Scientists have created embryos. What does that mean? And what comes next?

Professor Jose Polo in front of images of his model embryos.

Every cell in your body comes from a single cell: an egg, fertilised by a sperm. Each contains the exact same genetic blueprint for your life: your DNA. Yet cells in your brain look and behave nothing like those in your muscle or skin.

Scientists have created embryos. What does that mean? And what comes next?