Walter de Haas (1886–1969), who wrote under the pseudonym Hanns Günther was a prolific German author, translator, and editor of popular science books.
Read more about Walter De Haas: Work
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“Be advised what thou dost discourse of, and what thou maintainest whether touching religion, state, or vanity; for if thou err in the first, thou shalt be accounted profane; if in the second, dangerous; if in the third, indiscreet and foolish.”
—Sir Walter Raleigh (1552–1618)