His oeuvre is voluminous, diverse, and original; although some of his scientific writings contain unconfirmed theories and inaccuracies, his expertise, sagacity, and groundbreaking researches are widely acknowledged.

Indeed, theoretical definitions contain built-in theories; they cannot be simply reduced to describing a set of observations.

Mathematics contains hypotheses, while physics contains theories.

The second section, which is less focused and less easy to characterise, contains discussion of perspective machines and other technical aids as well as theories of perception.

The book has been criticised for containing theories based on medieval lore and art, rather than on historical treatment of the Bible.

His publications additionally contained information on how to build and use greenhouses, early theories regarding agricultural productivity, and pond ecology.

The epistolary equivalents of outsider art, the letters contain eccentric theories, pseudo-scientific information and cosmic visions; they are, by turns, funny, sad, scary and poetically beautiful (Johnson).

Nothing about them was technically false-the same could be said about any scientific theory-but the singling out of evolution on a text book that also contains theories regarding genetics, germs, and more is suspect.

For instance, the poem's Part IV contains a stunning inversion of Platonism and related theories about universals, such as the universal (property, feature) beauty.

Some of them had contained speculations and theories which had never been publicly discussed, not to mention an absolutely unrivaled store of first-hand observations.