- What is Entropy? (jasonfantl.com)
People say many things about entropy: entropy increases with time, entropy is disorder, entropy increases with energy, entropy determines the arrow of time, etc.. But I have no idea what entropy is, and from what I find, neither do most other people. This is the introduction I wish I had when first told about entropy, so hopefully you find it helpful. My goal is that by the end of this long post we will have a rigorous and intuitive understanding of those statements, and in particular, why the universe looks different when moving forward through time versus when traveling backward through time.
- Sufism (Wikipedia)
Sufism (Arabic: الصُّوفِيَّة aṣ-ṣūfiyya), also known as Tasawwuf (التَّصَوُّف at-taṣawwuf), is a mystic body of religious practice found within Islam which is characterized by a focus on Islamic purification, spirituality, ritualism, asceticism, and esotericism. It has been variously defined as “Islamic mysticism”, “the mystical expression of Islamic faith”, “the inward dimension of Islam”, “the phenomenon of mysticism within Islam”, the “main manifestation and the most important and central crystallization” of mystical practice in Islam, and “the interiorization and intensification of Islamic faith and practice”.