It's important to develop a personal relationship, not one based on observations of others.
The study was based on observations of oak toads.
Researchers have also proposed several theories based on observations of geography and diet.
The findings were based on observations of 550 delayed flights and 160 cancellations at 39 airports.
It was not based on observations of nature, measurements, tests, or experiments.
The classic modern example is a scientific experiment, where you can prove or disprove a theory based on observations of fact.
Based on observations of a supernova in 1604, Johannes Kepler calculated the "true date" of the birth of Jesus.
Nasa's Mars rovers, Spirit and Opportunity, which landed in 2004, have sent back strong evidence that liquid water once flowed on the surface in ancient times, based on observations of alterations in ancient rocks.
Based on observations of male langur succession events that did not involve infanticide, Dr. Pan suspects the animal's reproductive strategy may be evolving to include negotiated settlements between males.
The puzzling finding in 1999 that the universe's expansion seems to be accelerating was based on observations of a few dozen supernovae.
The predicted lifetime of Martian methane, based on observations of the Earth's atmosphere and experiments in laboratories, is just 300 years.
