- *Bevor die Sprache kam: Die Entstehung des Menschen aus der Vernetzung der Dinge* (Before language came: The emergence of man from the interconnectedness of things) (1991)
- *Die Entstehung des Geistes: Eine naturwissenschaftliche Deutung* (The origin of the mind: A scientific interpretation) (1994)
- *Die Evolution der Intelligenz: Vom Urknall zum Computer* (The evolution of intelligence: From the Big Bang to the computer) (1996)
- *Das Gehirn und seine Evolution: Eine Reise in die geheimnisvolle Schaltzentrale des Lebens* (The brain and its evolution: A journey into the mysterious control center of life) (1998)
- *Das Prinzip Leben: Die Entstehung und Entwicklung des Lebens auf der Erde* (The principle of life: The emergence and development of life on Earth) (1999)
- *Das Universum: Entstehung und Entwicklung des Kosmos* (The universe: Origin and development of the cosmos) (2000)
- *Die Zukunft der Menschheit: Eine naturwissenschaftliche Perspektive* (The future of humanity: A scientific perspective) (2001)
Scientific publications:
- "The emergence of consciousness in the evolution of the brain" (1994)
- "The relationship between brain structure and intelligence" (1995)
- "The evolution of language: From animal communication to human speech" (1996)
- "The role of genes and the environment in the development of intelligence" (1997)
- "The future of artificial intelligence: Potential benefits and risks" (1999)
- "The search for extraterrestrial life: Is there intelligent life in the universe?" (2000)
- "Climate change: Causes, consequences, and possible solutions" (2001)