ground

1 - A ground-breaking Australian study found that adults who own pets had lower blood pressure and cholesterol levels.

2 - Logistics as a business concept began to gain ground in the 1950s, particularly in the US.

3 - A cost-effective solution to the problem of airport congestion is to provide high-speed ground transportation between major cities lying 200 to 500 miles apart.

4 - An organism discovered deep in the ground has taken astrobiologists by surprise.

5 - Michelangelo did not like to delegate work to the students in his studio, though at that time the studios of the great masters of one age were the training ground for those of the next.