This reference, intended for the general reader, treats the problem of the origins of life on Earth as a Sherlock Holmes mystery to be solved. The reader is introduced to organic chemistry and the workings of an E. coli, to show how difficult it is to get chemical systems to produce products such as RNA or DNA, and yet, how very complex a simple cell is. It is suggested that perhaps instead of thinking classically as DNA as the controlling element and core of the cell, ie, DNA-> RNA-> proteins, think from a supply perspective, ie, at the core of the cell are carbon molecules such as carbon dioxide -> subcomponents -> amino acids -> nucleotides & DNA, ie, DNA is not at the core, but is most outward layer, and probably evolved the last too. It is proposed that the ultimate ancestor of life on Earth did not use RNA or DNA as a genetic system, but with evolution, a 'genetic takeover' occurred whereby the now-familiar RNA and DNA systems emerged. The phenomenon of self-assembly of molecules, from soap bubbles to the folding of proteins to the formation of crystals is discussed. This leads to the proposal that the very early genes on Earth were in fact 'crystal genes'. The crystallization of supersaturated solutions is discussed, and it is noted how small crystals cause 'reproduction' and 'growth' of more crystal from the supersaturated solution. Geological processes on Earth produce huge amounts of clay minerals. Crystals all have defect structures, with the result no two crystals are identical. The first 'lifeforms' on Earth were inorganic crystal-based entities that reproduced and grew as such. Since the supply perspective of the cell suggests that the biochemical structure is built up from carbon dioxide molecules, it is proposed that via photosynthesis the mineral lifeforms started producing organic molecules. It is noted that iron atoms are common in most clays, and could have 'caught' light and in conjunction with various patterns of clay layers, have synthesized organic molecules. Eventually the clay apparatus of the primitive lifeforms was replaced with RNA-like molecules, amino acids, membrane layers, and so on, and the DNA/RNA/protein form of life we are familiar with emerged. The seven clues referred to in the title of this reference are as follows: 1. Evolution can only occur when there is replication of some sort of genetic information. 2. DNA and RNA are difficult molecules to fabricate, far removed from the core of biochemical pathways. 3. To make an arch of stones needs scaffolding, and similarly, to originate the form of life we are now familiar with required some sort of scaffolding. 4. No particular fiber in a rope has to stretch from one end of the rope to the other end as long as they are adequately intertwined, and similarly, the lifeforms based on inorganic crystalline genes could have gradually evolved into lifeforms based on organic molecular genes. 5. A primitive machine must be easy to make from available materials and work with little fuss, while in the case of an advanced machine, the emphasis is on working well, and often it may be complex to assemble. 6. Crystals put themselves together and could have easily formed a 'low-tech' genetic material, unlike the complicated control required of organic molecules. 7. The Earth produces huge amounts of clay minerals.