Falb 1850-1854 visited the convent school in Abbey of St. Lambrecht, studied in Graz University of Theology, was ordained a priest and then worked in pastoral care. Later he became a teacher and studied in Prague mathematics, physics, astronomy and geology in Vienna.
1872 Falb converted to Protestantism. In 1868 he founded the popular astronomical journal Sirius. Between 1877 and 1880, he traveled for volcanological and archaeological studies of South and North America.
Due to his scientific studies, he had developed a new earthquake theory, which, however, was rated by the experts very critical. The opposition of the experts did not prevent him to develop even a weather theory from which he derived predictions of the weather in the long months ahead. About Here he issued a meteorological calendar in which he designated certain days as "critical days of the first order ". In later years he dealt with linguistics and built a link between the ancient Mexican languages and Hebrew. In a few years, a widely used all over the world following that took over his theories with great reverence that helped him in an emergency situation with a fundraiser out of trouble arose.
- Principles for a theory of earthquakes and volcanic eruptions. Graz 1870
- Thoughts and resources about the volcanism. Graz 1875
- Star and humans. Vienna 1882
- Of the upheaval in the universe. Vienna 1881
- The land of the Incas in its significance for the early history of language and writing. Leipzig 1883, reprint of the original. Ravenna Press in March Publishing, Herb Stein 1984.
- Weather letters. Vienna 1883
- The weather and the moon. Vienna 1892
- Critical days, Flood and Ice Age. Vienna 1895