TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Porous Particles: The porous particle has a mode particle size of at least 1-100 mu m; has an aspect ratio of at least 0.4. The porous particle further comprises a surface stabilizing material on the external particle surface that is poly(vinyl pyrrolidone), poly(vinyl alcohol), clay particles, colloidal silica, fumed silica or polymeric latex particles. The total volume of the discrete cavities is 5-80 wt.%.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The polymer precursor is an ethylenically unsaturated polymerizable monomer selected from vinyl monomers and acrylic monomers. The oil phase comprises an organic solvent that is selected from ethyl acetate, propyl acetate, chloromethane, dichloromethane, vinyl chloride, trichloromethane, carbon tetrachloride, ethylene chloride, trichloroethane, toluene, xylene, cyclohexanone, dimethyl carbonate, and/or 2-nitropropane. The water-in-oil-in-water emulsion is homogenized using a capillary orifice device; is homogenized using a back pressure of 100-5000 psi using a flow rate of 1000-6000 ml/minutes. Preferred Method: The method further involves: drying the solidified precursor porous particle. The water is added to the water-in-oil-in-water emulsion before removing the organic solvent or polymerizing the polymer precursor if present.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The cavity or pore stabilizing hydrocolloid is carboxymethyl cellulose (CMC), gelatin or gelatin derivative, protein or protein derivative, hydrophilic synthetic polymer, water-soluble microgel, polystyrene sulfonate, poly(2-acrylamido-2-methylpropane sulfonate and/or polyphosphonate. The cavity stabilizing hydrocolloid is present in an amount of 0.5-20 wt.%. The amphiphilic block copolymer comprises a hydrophilic segment comprising polyethyleneoxide and an oleophilic segment comprising polycaprolactone. The amphiphilic block copolymer is present in an amount of 1-99.5 wt.%. The water-insoluble polymer is a polyester, styrenic polymer, acrylic polymer, mono-olefin polymer, vinyl ester polymer, alpha -methylene aliphatic monocarboxylic acid ester polymer, vinyl ether polymer, vinyl ketone polymer, or aliphatic cellulose ester polymer. The amphiphilic block copolymer emulsifier comprises a hydrophilic segment comprising polyethyleneoxide and an oleophilic segment comprising polycaprolactone. The surface stabilizing material is present in the water-in-oil-in-water emulsion in an amount of 0.1-10 wt.%. EXAMPLE - 102 g Oil phase containing 2 wt.%, polyethyleneoxide (PEO)-b-polycaprolactone (PCL) amphiphilic block copolymer (with 5000-20000 segment molecular weights) and 98 wt.% methyl methacrylate was emulsified with an aqueous phase prepared with 31.4 g of 2 wt.% solution of carboxy methyl cellulose in water using the Silverson Mixer followed by homogenization at 9800 psi to give a water-in-oil emulsion that had a droplet size of 0.38 mu m. The resulting water-in-oil emulsion was uniform and did not destabilize with time, compared to the emulsion formed in the same manner but without the cavity stabilizing hydrocolloid in the first aqueous phase. This example showed that the cavity stabilizing hydrocolloid was needed in the first aqueous phase to provide a stable first water-in-oil emulsion.