Certification schemes are the floor, not the ceiling of responsible forestry practice.

Introspection is the only method by which the mind can be directly observed.

The United States is experiencing a crisis of political decay, with institutions that are increasingly dysfunctional and unable to address the country's challenges.

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

建筑是文化价值观随时间推移的物质表现。