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The pre-race and first in-race report from Le Mans

The 2013, 90th anniversary edition of the 24 Hours of Le Mans has begun, tragedy marking the opening laps with the death of Allan Simonsen. We're at the track now as a guest of Audi and plan to stay through the evening, and even we haven't been able to find out what caused the accident - the only video is from just after the incident, and beyond the statement from ACO there's been no more news. The Aston Martin in the LM GTE Am class and its all-Danish drivers had taken pole in its class and was one of the favorites to win.
The pre-race report will come first, and even thought we can't spoil the race because we're only five hours into it at the time of writing, we'll put all of the news at the end in case you don't even want the updates.
Or you can go straight to the high-res galleries above.

Recharge Wrap-up: Ferrock a carbon-negative cement substitute, Audi makes e-diesel

A cement alternative uses recycled materials and traps CO2 rather than producing it. Invented by David Stone at the University of Arizona, Ferrock uses recycled steel dust and glass to produce a substance stronger than conventional concrete. Cement has a high carbon footprint from the high heat needed to process the limestone. Ferrock needs no such heat, and it actually uses CO2 to harden, making it, as Stone calls it, a carbon-negative material. Learn more in the video above, see the transcript at PBS NewsHour and read more at Green Car Reports. Teslarati offers a detailed rundown of Tesla's new Valet Mode feature for the Model S. Part of the Firmware 6.2 update, Valet Mode allows the owner to disable certain performance features and block personal information when letting someone else drive the car. It limits the car's to speed to 70 miles per hour, and caps output at 80 kW. It can also disable mobile app access, Homelink, Bluetooth and wifi and the "Places" function, which stores addresses for you. The folks at Teslarati did find some shortcomings in the new feature, though. Read more at Teslarati. Audi has produced its first batch of e-diesel made from water and CO2. The fuel is made by reacting hydrogen from the water with CO2 to make long-chain hydrocarbon compounds called "blue crude." That can then be refined similarly to crude oil to make e-diesel, which is a fuel free from sulfur and aromatic hydrocarbons. That e-diesel can be used on its own, or mixed with fossil fuel diesel to power a vehicle. "In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long-distance mobility with virtually no impact on the climate," says Audi Head of Sustainable Product Development Reiner Mangold. Read more in the press release below. Fuel of the future: Research facility in Dresden produces first batch of Audi e-diesel - The verdict: Pilot plant produces high-quality diesel fuel - No need for mineral oil: e-diesel made from water, CO2 and green power - Minister Wanka: "Synthetic diesel using CO2 is a huge success" Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel. After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high-quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof.

Audi rumored to buy Alfa Romeo, officials deny it

For more than two years, Volkswagen has been making public statements about its willingness to buy Alfa Romeo and quadruple the Italian brand's sales, and for just as long, Fiat CEO Sergio Marchionne has replied with some version of "Mr. Piëch, drop it." According to a report in Ward's Auto, all that jousting might be over: it claims that sources close to both Marchionne and Audi CEO Rupert Stadler admit that the two are in talks for Audi to buy not just Alfa Romeo, but a production plant in Italy. In fact, a final deal could possibly include partsmaker Magnetti Marelli.
Against that backdrop, a report by German news weekly Stern quotes a Fiat spokesmen as saying it doesn't comment on rumors and an Audi rep has said flatly that "There is no substance in the news." If a sale is being arranged, the timing would seem to point to how eager Fiat is to raise cash to complete its major initiatives. Even though Alfa Romeo continues to delay its return to the US, it just showed off the production version of the 4C at the Geneva Motor Show (shown above) and said that preferred Fiat dealerships here would get them. Then there's Alfa's recently concluded deal with Mazda to develop a roadster based on the next generation MX-5 Miata - a deal that would seem to help both the Italian and Japanese brands.
The monetary issues are troublesome, though. Fiat is taking a beating in the European market and its weak-kneed balance sheet is delaying gotta-have-it products like the Jeep Cherokee. Fiat has been talking to banks about getting money to buy the rest of Chrysler and those financial institutions have also raised issues about debt and cash reserves, and the nasty game of chess Fiat is playing with the United Auto Workers (and now the court system about the portion of Chrysler it doesn't own) could end up blowing another hole in Marchionne's plans. It is possible that this could finally have convinced Fiat to at least see how serious Audi's parent company, Volkswagen, is about buying Alfa Romeo. Or it could be just another rumor.