He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio products, including headphones and speakers. He's also an e-reader and e-publishing expert as well ...

Below, we guide you through the five primary Greeks—delta, gamma, theta, vega, and rho—explaining what each tells you, how they interact, and why they matter when you're trading options.

Samsung Z1 mobile was launched in January 2015. The phone comes with a 4.00-inch touchscreen display offering a resolution of 480x800 pixels. Samsung Z1 is powered by a 1.2GHz dual-core processor. It ...