Like all plants, he said, algae cannot make chlorophyll without iron.

But without order-strengthened black iron, the Nordlans were limited in what their boilers could handle.

Cancer cells can live in a semidormant state for a long time, he explained, but they cannot multiply without iron and oxygen from blood.

Without sufficient iron, parts of the leaf begin to turn yellow - usually beginning with the areas between the veins of the leaves.

Without iron and energy, we probably would not have gotten nearly as far as we have today.

Without iron and the rest you can't build machines, and without technology you're a backwater.

Some have taken "without iron" to mean that the hasta pura had no head at all.

The history of the world without iron followed a completely different path from ours.

Without iron, the blood cannot carry oxygen effectively.

No high-pressure steam boiler will operate without black iron - not now, and only small ones at that.